Last data update: May 13, 2024. (Total: 46773 publications since 2009)
Records 1-22 (of 22 Records) |
Query Trace: Ahrens KA[original query] |
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Excess deaths associated with COVID-19 by rurality and demographic factors in the United States
Ahrens KA , Rossen LM , Milkowski C , Gelsinger C , Ziller E . J Rural Health 2023 PURPOSE: To estimate percent excess deaths during the COVID-19 pandemic by rural-urban residence in the United States and to describe rural-urban disparities by age, sex, and race/ethnicity. METHODS: Using US mortality data, we used overdispersed Poisson regression models to estimate monthly expected death counts by rurality of residence, age group, sex, and race/ethnicity, and compared expected death counts with observed deaths. We then summarized excess deaths over 6 6-month time periods. FINDINGS: There were 16.9% (95% confidence interval [CI]: 16.8, 17.0) more deaths than expected between March 2020 and February 2023. The percent excess varied by rurality (large central metro: 18.2% [18.1, 18.4], large fringe metro: 15.6% [15.5, 15.8], medium metro: 18.1% [18.0, 18.3], small metro: 15.5% [15.3, 15.7], micropolitan rural: 16.3% [16.1, 16.5], and noncore rural: 15.8% [15.6, 16.1]). The percent excess deaths were 20.2% (20.1, 20.3) for males and 13.6% (13.5, 13.7) for females, and highest for Hispanic persons (49% [49.0, 49.6]), followed by non-Hispanic Black persons (28% [27.5, 27.9]) and non-Hispanic White persons (12% [11.6, 11.8]). The 6-month time periods with the highest percent excess deaths for large central metro areas were March 2020-August 2020 and September 2020-February 2021; for all other areas, these time periods were September 2020-February 2021 and September 2021-February 2022. CONCLUSION: Percent excess deaths varied by rurality, age group, sex, race/ethnicity, and time period. Monitoring excess deaths by rurality may be useful in assessing the impact of the pandemic over time, as rural-urban patterns appear to differ. |
Maternal hepatitis C prevalence and trends by county, US: 2016-2020
Ahrens KA , Rossen LM , Burgess AR , Palmsten K , Ziller EC . Paediatr Perinat Epidemiol 2022 37 (2) 134-142 BACKGROUND: Trends in the prevalence of hepatitis C virus (HCV) infection among women delivering live births may differ in rural vs. urban areas of the United States, but estimation of trends based on observed counts may lead to unstable estimates in rural counties due to small numbers. OBJECTIVES: The objective of the study was to use small area estimation methods to provide updated county-level prevalence estimates and, for the first time, trends in maternal HCV infection among live births by county-level rurality. METHODS: Cross-sectional natality data from 2016 to 2020 were used to estimate maternal hepatitis C prevalence using hierarchical Bayesian models with spatiotemporal random effects to produce annual county-level estimates of maternal HCV infection and trends over time. Models included a 6-level rural-urban county classification, year, maternal characteristics and county-specific covariates. Data were analysed in 2022. RESULTS: There were 90,764/18,905,314 live births (4.8 per 1000) with HCV infection reported on the birth certificate. Hepatitis C prevalence was higher among rural counties as compared to urban counties. Rural counties had the largest annual increases in maternal hepatitis C prevalence (per 1000 births) from 2016 to 2020 (micropolitan: 0.39; noncore: 0.40), with smaller increases among less densely populated urban counties (medium metro: 0.28; small metro: 0.28) and urban counties (large central metro:0.11; large fringe metro: 0.14). CONCLUSIONS: The prevalence of maternal HCV infection was the highest in rural counties, and rural counties saw the greatest average prevalence increase during 2016-2020. County-level data can help in monitoring rural-urban trends in maternal HCV infection to reduce geographic disparities. |
Rural-Urban Differences in Maternal Mortality Trends in the US, 1999-2017: Accounting for the Impact of the Pregnancy Status Checkbox
Rossen LM , Ahrens KA , Womack LS , Uddin SFG , Branum AM . Am J Epidemiol 2022 191 (6) 1030-1039 Rural-urban differences in maternal mortality ratios (MMR) in the United States have been difficult to measure in recent years due to the incremental adoption of a pregnancy status checkbox on death certificates. Using 1999-2017 mortality and birth data, we examined the impact of the pregnancy checkbox on MMRs by rural-urban residence (large urban, medium/small urban, rural), using log-binomial regression models to predict trends as if all states had adopted the checkbox as of 1999. Implementation of the checkbox resulted in an average estimated increase of 7.5 maternal deaths per 100,000 live births (95% CI: 6.3, 8.8) in large urban areas (76% increase), 11.6 (95% CI: 9.6, 13.6) in medium/small urban areas (113% increase), and 16.6 (95% CI: 12.9, 20.3) in rural areas (107% increase), compared with MMRs prior to the checkbox. Assuming all states had the checkbox as of 1999, demographic-adjusted predicted MMRs increased in rural, declined in large urban, and did not change in medium/small urban areas. However, trends and urban-rural differences were substantially attenuated when analyses were limited to direct/specific causes of maternal death, which are likely subject to less misclassification. Accurate ascertainment of maternal deaths, particularly in rural areas, is important for reducing disparities in maternal mortality. |
Rural-Urban Residence and Maternal Hepatitis C Infection, U.S.: 2010-2018
Ahrens KA , Rossen LM , Burgess AR , Palmsten KK , Ziller EC . Am J Prev Med 2021 60 (6) 820-830 INTRODUCTION: The prevalence of hepatitis C virus infection among women delivering live births in the U.S. may be higher in rural areas where county-level estimates may be unreliable. The aim of this study is to model county-level maternal hepatitis C virus infection among deliveries in the U.S. METHODS: In 2020, U.S. natality files (2010-2018) with county-level maternal residence information were used from states that had adopted the 2003 revised U.S. birth certificate, which included a field for hepatitis C virus infection present during pregnancy. Hierarchical Bayesian spatial models with spatiotemporal random effects were applied to produce stable annual county-level estimates of maternal hepatitis C virus infection for years when all states had adopted the revised birth certificate (2016-2018). Models included a 6-Level Urban-Rural County Classification Scheme along with the birth year and county-specific covariates to improve posterior predictions. RESULTS: Among approximately 32 million live births, the overall prevalence of maternal hepatitis C virus infection was 3.5 per 1,000 births (increased from 2.0 in 2010 to 5.0 in 2018). During 2016-2018, posterior predicted median county-level maternal hepatitis C virus infection rates showed that nonurban counties had 3.5-3.8 times higher rates of hepatitis C virus than large central metropolitan counties. The counties in the top 10th percentile for maternal hepatitis C virus rates in 2018 were generally located in Appalachia, in Northern New England, along the northern border in the Upper Midwest, and in New Mexico. CONCLUSIONS: Further implementation of community-level interventions that are effective in reducing maternal hepatitis C virus infection and its subsequent morbidity may help to reduce geographic and rural disparities. |
Beyond birth outcomes: Interpregnancy interval and injury-related infant mortality
Thoma ME , Rossen LM , De Silva DA , Warner M , Simon AE , Moskosky S , Ahrens KA . Paediatr Perinat Epidemiol 2019 33 (5) 360-370 BACKGROUND: Several studies have examined the association between IPI and birth outcomes, but few have explored the association between interpregnancy interval (IPI) and postnatal outcomes. OBJECTIVE: We examined the association between IPI and injury-related infant mortality, a leading cause of postneonatal mortality. METHODS: We used 2011-2015 US period-linked birth-infant death vital statistics data to generate a multiyear birth cohort of non-first-born singleton births (N = 9 782 029). IPI was defined as the number of months between a live birth and the start of the pregnancy leading to the next live birth. Causes of death in the first year of life were identified using ICD-10 codes. Hazard ratios (HR) for IPI categories were estimated using Cox proportional hazards models adjusted for birth order, county poverty level, and maternal characteristics (marital status, race/ethnicity, education, age at previous birth). RESULTS: After adjustment, overall infant mortality (48.1 per 10 000 births) was higher for short and long IPIs compared with IPI 18-23 months (reference): <6, aHR 1.61, 95% CI 1.54, 1.68; 6-11, aHR 1.22, 95% CI 1.17, 1.26; and 60+ months, aHR 1.12, 95% CI 1.08, 1.16. In comparison, the risk of injury-related infant mortality (4.4 per 10 000 births) decreased with longer IPIs: <6, aHR 1.77, 95% CI 1.55, 2.01; 6-11, aHR 1.41, 95% CI 1.25, 1.59; 12-17, aHR 1.25, 95% CI 1.10, 1.41; 24-59, aHR 0.78, 95% CI 0.69, 0.87; and 60+ months, aHR 0.55, 95% CI 0.48, 0.62. CONCLUSION: Unlike overall infant mortality, injury-related infant mortality decreased with IPI length. While injury-related deaths are rare, these patterns suggest that the timing between births may be a marker of risk for fatal infant injuries. The first year postpartum may be an ideal time for the delivery of evidence-based injury prevention programmes as well as family planning services. |
Clinic-based programs to prevent repeat teen pregnancy: A systematic review
Frederiksen BN , Rivera MI , Ahrens KA , Malcolm NM , Brittain AW , Rollison JM , Moskosky SB . Am J Prev Med 2018 55 (5) 736-746 CONTEXT: The purpose of this paper is to synthesize and evaluate the evidence on the effectiveness of repeat teen pregnancy prevention programs offered in clinical settings. EVIDENCE ACQUISITION: Multiple databases were searched for peer-reviewed articles published from January 1985 to April 2016 that included key terms related to adolescent reproductive health services. Analysis of these studies occurred in 2017. Studies were excluded if they focused solely on sexually transmitted disease/HIV prevention services, or occurred outside of a clinic setting or the U.S., Canada, Europe, Australia, or New Zealand. Inclusion and exclusion criteria further narrowed the studies to those that included information on at least one short-term (e.g., increased knowledge); medium-term (e.g., increased contraceptive use); or long-term (e.g., decreased repeat teen pregnancy) outcome, or identified contextual barriers or facilitators for providing adolescent-focused family planning services. Standardized abstraction methods and tools were used to synthesize the evidence and assess its quality. Only studies of clinic-based programs focused on repeat teen pregnancy prevention were included in this review. EVIDENCE SYNTHESIS: The search strategy identified 27,104 citations, 940 underwent full-text review, and 120 met the adolescent-focused family planning services inclusion criteria. Only five papers described clinic-based programs focused on repeat teen pregnancy prevention. Four studies found positive (n=2) or null (n=2) effects on repeat teen pregnancy prevention; an additional study described facilitators for helping teen mothers remain linked to services. CONCLUSIONS: This review identified clinic-based repeat teen pregnancy prevention programs and few positively affect factors that may reduce repeat teen pregnancy. Access to immediate postpartum contraception or home visiting programs may be opportunities to meet adolescents where they are and reduce repeat teen pregnancy. THEME INFORMATION: This article is part of a theme issue entitled Updating the Systematic Reviews Used to Develop the U.S. Recommendations for Providing Quality Family Planning Services, which is sponsored by the Office of Population Affairs, U.S. Department of Health and Human Services. |
Good practices for the design, analysis, and interpretation of observational studies on birth spacing and perinatal health outcomes
Hutcheon JA , Moskosky S , Ananth CV , Basso O , Briss PA , Ferre CD , Frederiksen BN , Harper S , Hernandez-Diaz S , Hirai AH , Kirby RS , Klebanoff MA , Lindberg L , Mumford SL , Nelson HD , Platt RW , Rossen LM , Stuebe AM , Thoma ME , Vladutiu CJ , Ahrens KA . Paediatr Perinat Epidemiol 2018 33 (1) O15-O24 BACKGROUND: Meta-analyses of observational studies have shown that women with a shorter interpregnancy interval (the time from delivery to start of a subsequent pregnancy) are more likely to experience adverse pregnancy outcomes, such as preterm delivery or small for gestational age birth, than women who space their births further apart. However, the studies used to inform these estimates have methodological shortcomings. METHODS: In this commentary, we summarise the discussions of an expert workgroup describing good practices for the design, analysis, and interpretation of observational studies of interpregnancy interval and adverse perinatal health outcomes. RESULTS: We argue that inferences drawn from research in this field will be improved by careful attention to elements such as: (a) refining the research question to clarify whether the goal is to estimate a causal effect vs describe patterns of association; (b) using directed acyclic graphs to represent potential causal networks and guide the analytic plan of studies seeking to estimate causal effects; (c) assessing how miscarriages and pregnancy terminations may have influenced interpregnancy interval classifications; (d) specifying how key factors such as previous pregnancy loss, pregnancy intention, and maternal socio-economic position will be considered; and (e) examining if the association between interpregnancy interval and perinatal outcome differs by factors such as maternal age. CONCLUSION: This commentary outlines the discussions of this recent expert workgroup, and describes several suggested principles for study design and analysis that could mitigate many potential sources of bias. |
Report of the Office of Population Affairs' expert work group meeting on short birth spacing and adverse pregnancy outcomes: Methodological quality of existing studies and future directions for research
Ahrens KA , Hutcheon JA , Ananth CV , Basso O , Briss PA , Ferre CD , Frederiksen BN , Harper S , Hernandez-Diaz S , Hirai AH , Kirby RS , Klebanoff MA , Lindberg L , Mumford SL , Nelson HD , Platt RW , Rossen LM , Stuebe AM , Thoma ME , Vladutiu CJ , Moskosky S . Paediatr Perinat Epidemiol 2018 33 (1) O5-O14 BACKGROUND: The World Health Organization (WHO) recommends that women wait at least 24 months after a livebirth before attempting a subsequent pregnancy to reduce the risk of adverse maternal, perinatal, and infant health outcomes. However, the applicability of the WHO recommendations for women in the United States is unclear, as breast feeding, nutrition, maternal age at first birth, and total fertility rate differs substantially between the United States and the low- and middle-resource countries upon which most of the evidence is based. METHODS: To inform guideline development for birth spacing specific to women in the United States, the Office of Population Affairs (OPA) convened an expert work group meeting in Washington, DC, on 14-15 September 2017 among reproductive, perinatal, paediatric, social, and public health epidemiologists; obstetrician-gynaecologists; biostatisticians; and experts in evidence synthesis related to women's health. RESULTS: Presentations and discussion topics included the methodological quality of existing studies, evaluation of the evidence for causal effects of short interpregnancy intervals on adverse perinatal and maternal health outcomes, good practices for future research, and identification of research gaps and priorities for future work. CONCLUSIONS: This report provides an overview of the presentations, discussions, and conclusions from the expert work group meeting. |
Unintended pregnancy and interpregnancy interval by maternal age, National Survey of Family Growth
Ahrens KA , Thoma M , Copen C , Frederiksen B , Decker E , Moskosky S . Contraception 2018 98 (1) 52-55 BACKGROUND: The relationship between unintended pregnancy and interpregnancy interval (IPI) across maternal age is not clear. METHODS: Using data from the National Survey of Family Growth, we estimated the percentages of pregnancies that were unintended among IPI groups (<6, 6-11, 12-17, 18-23, 24+ months) by maternal age at last live birth (15-19, 20-24, 25-29, 30-44years). RESULTS: Approximately 40% of pregnancies were unintended and 36% followed an IPI<18months. Within each maternal age group, the percentage of pregnancies that were unintended decreased as IPI increased. CONCLUSION: Unintended pregnancies are associated with shorter IPI across the reproductive age spectrum. |
Trends in health insurance coverage of Title X Family Planning Program clients, 2005-2015
Decker EJ , Ahrens KA , Fowler CI , Carter M , Gavin L , Moskosky S . J Womens Health (Larchmt) 2017 27 (5) 684-690 BACKGROUND: The federal Title X Family Planning Program supports the delivery of family planning services and related preventive care to 4 million individuals annually in the United States. The implementation of the 2010 Affordable Care Act's (ACA's) Medicaid expansion and provisions expanding access to health insurance, which took effect in January 2014, resulted in higher rates of health insurance coverage in the U.S. population; the ACA's impact on individuals served by the Title X program has not yet been evaluated. METHODS: Using administrative data we examined changes in health insurance coverage among Title X clinic patients during 2005-2015. RESULTS: We found that the percentage of clients without health insurance decreased from 60% in 2005 to 48% in 2015, with the greatest annual decrease occurring between 2013 and 2014 (63% to 54%). Meanwhile, between 2005 and 2015, the percentage of clients with Medicaid or other public health insurance increased from 20% to 35% and the percentage of clients with private health insurance increased from 8% to 15%. CONCLUSIONS: Although clients attending Title X clinics remained uninsured at substantially higher rates compared with the national average, the increase in clients with health insurance coverage aligns with the implementation of ACA-related provisions to expand access to affordable health insurance. |
Interpregnancy Interval and Adverse Pregnancy Outcomes: An Analysis of Successive Pregnancies
Ahrens KA , Thoma ME , Rossen LM . Obstet Gynecol 2017 130 (2) 464 Hanley et al1 present a compelling analysis of interpregnancy intervals and adverse pregnancy outcomes using a case-crossover design to analyze data from Canadian women with at least three deliveries between 2000 and 2015. Consistent with a previous analysis,2 the authors found that adverse associations between short interpregnancy interval and neonatal outcomes commonly reported in studies using unmatched analyses were erased (or even reversed) after conducting a case-crossover analysis. Although we agree with Hanley et al that time-invariant confounding is most likely reduced when using a within-woman study design such as case-crossover analysis, it may be at the expense of generalizability. | | As the study authors point out, unmatched designs use information from all women, whereas case-crossover analyses use information only from women with discordant exposures and outcomes.1,3 According to the article’s appendix tables, of the 38,178 women with at least three deliveries included in the unmatched analysis, 14% had discordant preterm birth outcomes (n = 5,195). Because 27% of women overall had discordant interpregnancy intervals (one in the reference group, one not in the reference group), approximately 3.8% (n = 1,457) of the total cohort presumably provided data for the case-crossover analysis on preterm birth. Although the authors note that their results may not generalize to other settings, further work on the generalizability of case-crossover analyses, which by design exclude individuals who have not experienced the outcome under study, to the broader target population would be welcome.4 |
Receipt of selected preventive health services for women and men of reproductive age - United States, 2011-2013
Pazol K , Robbins CL , Black LI , Ahrens KA , Daniels K , Chandra A , Vahratian A , Gavin LE . MMWR Surveill Summ 2017 66 (20) 1-31 PROBLEM/CONDITION: Receipt of key preventive health services among women and men of reproductive age (i.e., 15-44 years) can help them achieve their desired number and spacing of healthy children and improve their overall health. The 2014 publication Providing Quality Family Planning Services: Recommendations of CDC and the U.S. Office of Population Affairs (QFP) establishes standards for providing a core set of preventive services to promote these goals. These services include contraceptive care for persons seeking to prevent or delay pregnancy, pregnancy testing and counseling, basic infertility services for those seeking to achieve pregnancy, sexually transmitted disease (STD) services, and other preconception care and related preventive health services. QFP describes how to provide these services and recommends using family planning and other primary care visits to screen for and offer the full range of these services. This report presents baseline estimates of the use of these preventive services before the publication of QFP that can be used to monitor progress toward improving the quality of preventive care received by women and men of reproductive age. PERIOD COVERED: 2011-2013. DESCRIPTION OF THE SYSTEM: Three surveillance systems were used to document receipt of preventive health services among women and men of reproductive age as recommended in QFP. The National Survey of Family Growth (NSFG) collects data on factors that influence reproductive health in the United States since 1973, with a focus on fertility, sexual activity, contraceptive use, reproductive health care, family formation, child care, and related topics. NSFG uses a stratified, multistage probability sample to produce nationally representative estimates for the U.S. household population of women and men aged 15-44 years. This report uses data from the 2011-2013 NSFG. The Pregnancy Risk Assessment Monitoring System (PRAMS) is an ongoing, state- and population-based surveillance system designed to monitor selected maternal behaviors and experiences that occur before, during, and shortly after pregnancy among women who deliver live-born infants in the United States. Annual PRAMS data sets are created and used to produce statewide estimates of preconception and perinatal health behaviors and experiences. This report uses PRAMS data for 2011-2012 from 11 states (Hawaii, Maine, Maryland, Michigan, Minnesota, Nebraska, New Jersey, Tennessee, Utah, Vermont, and West Virginia). The National Health Interview Survey (NHIS) is a nationally representative survey of noninstitutionalized civilians in the United States. NHIS collects data on a broad range of health topics, including the prevalence, distribution, and effects of illness and disability and the services rendered for or because of such conditions. Households are identified through a multistage probability household sampling design, and estimates are produced using weights that account for the sampling design, nonresponse, and poststratification adjustments. This report uses data from the 2013 NHIS for women aged 18-44 years. RESULTS: Many preventive health services recommended in QFP were not received by all women and men of reproductive age. For contraceptive services, including contraceptive counseling and advice, 46.5% of women aged 15-44 years at risk for unintended pregnancy received services in the past year, and 4.5% of men who had vaginal intercourse in the past year received services in that year. For sexually transmitted disease (STD) services, among all women aged 15-24 years who had oral, anal, or vaginal sex with an opposite sex partner in the past year, 37.5% were tested for chlamydia in that year. Among persons aged 15-44 years who were at risk because they were not in a mutually monogamous relationship during the past year, 45.3% of women were tested for chlamydia and 32.5% of men were tested for any STD in that year. For preconception care and related preventive health services, data from selected states indicated that 33.2% of women with a recent live birth (i.e., 2-9 months postpartum) talked with a health care professional about improving their health before their most recent pregnancy; of selected preconception counseling topics, the most frequently discussed was taking vitamins with folic acid before pregnancy (81.2%), followed by achieving a healthy weight before pregnancy (62.9%) and how drinking alcohol (60.3%) or smoking (58.2%) during pregnancy can affect a baby. Nationally, among women aged 18-44 years irrespective of pregnancy status, 80.9% had their blood pressure checked by a health care professional and 31.7% received an influenza vaccine in the past year; 54.5% of those with high blood pressure were tested for diabetes, 44.9% of those with obesity had a health care professional talk with them about their diet, and 55.2% of those who were current smokers had a health professional talk with them about their smoking in the past year. Among all women aged 21-44 years, 81.6% received a Papanicolaou (Pap) test in the past 3 years. Receipt of certain preventive services varied by age and race/ethnicity. Among women with a recent live birth, the percentage of those who talked with a health care professional about improving their health before their most recent pregnancy increased with age (range: 25.9% and 25.2% for women aged ≤19 and 20-24 years, respectively, to 35.9% and 37.8% for women aged 25-34 and ≥35 years, respectively). Among women with a recent live birth, the percentage of those who talked with a health care professional about improving their health before their most recent pregnancy was higher for non-Hispanic white (white) (35.2%) compared with non-Hispanic black (black) (30.0%) and Hispanic (26.0%) women. Conversely, across most STD screening services evaluated, testing was highest among black women and men and lowest among their white counterparts. Receipt of many preventive services recommended in QFP increased consistently across categories of family income and continuity of health insurance coverage. Prevalence of service receipt was highest among women in the highest family income category (>400% of federal poverty level [FPL]) and among women with insurance coverage for each of the following: contraceptive services among women at risk for unintended pregnancy; medical services beyond advice to help achieve pregnancy; vaccinations (hepatitis B and human papillomavirus [HPV], ever; tetanus, past 10 years; influenza, past year); discussions with a health care professional about improving health before pregnancy and taking vitamins with folic acid; blood pressure and diabetes screening; discussions with a health care professional in the past year about diet, among those with obesity; discussions with a health care professional in the past year about smoking, among current smokers; Pap tests within the past 3 years; and mammograms within the past 2 years. INTERPRETATION: Before 2014, many women and men of reproductive age were not receiving several of the preventive services recommended for them in QFP. Although differences existed by age and race/ethnicity, across the range of recommended services, receipt was consistently lower among women and men with lower family income and greater instability in health insurance coverage. PUBLIC HEALTH ACTION: Information in this report on baseline receipt during 2011-2013 of preventive services for women and men of reproductive age can be used to target improvements in the use of recommended services through the development ofresearch priorities, information for decision makers, and public health practice. Health care administrators and practitioners can use the information to identify subpopulations with the greatest need for preventive services and make informed decisions on resource allocation. Public health researchers can use the information to guide research on the determinants of service use and factors that might increase use of preventive services. Policymakers can use this information to evaluate the impact of policy changes and assess resource needs for effective programs, research, and surveillance on the use of preventive health services for women and men of reproductive age. |
Trends in risk of pregnancy loss among US women, 1990-2011
Rossen LM , Ahrens KA , Branum AM . Paediatr Perinat Epidemiol 2017 32 (1) 19-29 BACKGROUND: Pregnancy loss can have physical and psychological consequences for women and their families. Though a previous study described an increase in the risk of self-reported pregnancy loss from 1970 to 2000, more recent examinations from population-based data of US women are lacking. METHODS: We used data from the 1995, 2002, 2006-2010, 2011-2015 National Survey of Family Growth on self-reported pregnancy loss (miscarriage, stillbirth, ectopic pregnancy) among US women (15-44 years) who reported at least one pregnancy conceived during 1990-2011 that did not result in induced termination (n = 20 012 women; n = 42 526 pregnancies). Trends in the risk of self-reported pregnancy loss and early pregnancy loss (<12 weeks) were estimated, separately, by year of pregnancy conception (limited to 1990-2011 to ensure a sufficient sample of pregnancies for each year and maternal age group) using log-Binomial and Poisson models, adjusted for maternal- and pregnancy-related factors. RESULTS: Among all self-reported pregnancies, excluding induced terminations, the risk of pregnancy loss was 19.7% and early pregnancy loss was 13.5% during 1990-2011. Risk of pregnancy loss increased by a relative 2% (rate ratio [RR] 1.02, 95% confidence interval [CI] 1.01, 1.02) per year in unadjusted models and 1% per year (RR 1.01, 95% CI 1.00, 1.02) during 1990-2011, after adjustment for maternal characteristics and pregnancy-related factors. In general, trends were similar for early pregnancy loss. CONCLUSION: From 1990 to 2011, risk of self-reported pregnancy loss increased among US women. Further work is needed to better understand the drivers of this increase in reported pregnancy loss in the US. |
Birth order and injury-related infant mortality in the U.S
Ahrens KA , Rossen LM , Thoma ME , Warner M , Simon AE . Am J Prev Med 2017 53 (4) 412-420 INTRODUCTION: The purpose of this study was to evaluate the risk of death during the first year of life due to injury, such as unintentional injury and homicide, by birth order in the U.S. METHODS: Using national birth cohort-linked birth-infant death data (births, 2000-2010; deaths, 2000-2011), risks of infant mortality due to injury in second-, third-, fourth-, and fifth or later-born singleton infants were compared with first-born singleton infants. Risk ratios were estimated using log-binomial models adjusted for maternal age, marital status, race/ethnicity, and education. The statistical analyses were conducted in 2016. RESULTS: Approximately 40%, 32%, 16%, 7%, and 4% of singleton live births were first, second, third, fourth, and fifth or later born, respectively. From 2000 to 2011, a total of 15,866 infants died as a result of injury (approximately 1,442 deaths per year). Compared with first-born infants (2.9 deaths per 10,000 live births), second or later-born infants were at increased risk of infant mortality due to injury (second, 3.6 deaths; third, 4.2 deaths; fourth, 4.8 deaths; fifth or later, 6.4 deaths). The corresponding adjusted risk ratios were as follows: second, 1.84 (95% CI=1.76, 1.91); third, 2.42 (95% CI=2.30, 2.54); fourth, 2.96 (95% CI=2.77, 3.16); and fifth or later, 4.26 (95% CI=3.96, 4.57). CONCLUSIONS: Singleton infants born second or later were at increased risk of mortality due to injury during their first year of life in the U.S. This study's findings highlight the importance of investigating underlying mechanisms behind this increased risk. |
Plurality of birth and infant mortality due to external causes in the United States, 2000-2010
Ahrens KA , Thoma ME , Rossen LM , Warner M , Simon AE . Am J Epidemiol 2017 185 (5) 1-10 Risk of death during the first year of life due to external causes, such as unintentional injury and homicide, may be higher among twins and higher-order multiples than among singletons in the United States. We used national birth cohort linked birth-infant death data (2000-2010) to evaluate the risk of infant mortality due to external causes in multiples versus singletons in the United States. Risk of death from external causes during the study period was 3.6 per 10,000 live births in singletons and 5.1 per 10,000 live births in multiples. Using log-binomial regression, the corresponding unadjusted risk ratio was 1.40 (95% confidence interval (CI): 1.30, 1.50). After adjustment for maternal age, marital status, race/ethnicity, and education, the risk ratio was 1.68 (95% CI: 1.56, 1.81). Infant deaths due to external causes were most likely to occur between 2 and 7 months of age. Applying inverse probability weighting and assuming a hypothetical intervention where no infants were low birth weight, the adjusted controlled direct effect of plurality on infant mortality due to external causes was 1.64 (95% CI: 1.39, 1.97). Twins and higher-order multiples were at greater risk of infant mortality due to external causes, particularly between 2 and 7 months of age, and this risk appeared to be mediated largely by factors other than low-birth-weight status. |
Housing assistance and blood lead levels: Children in the United States, 2005-2012
Ahrens KA , Haley BA , Rossen LM , Lloyd PC , Aoki Y . Am J Public Health 2016 106 (11) e1-e8 OBJECTIVES: To compare blood lead levels (BLLs) among US children aged 1 to 5 years according to receipt of federal housing assistance. METHODS: In our analyses, we used 2005 to 2012 data for National Health and Nutrition Examination Survey (NHANES) respondents that were linked to 1999 to 2014 administrative records from the US Department of Housing and Urban Development (HUD). After we restricted the analysis to children with family income-to-poverty ratios below 200%, we compared geometric mean BLLs and the prevalence of BLLs of 3 micrograms per deciliter or higher among children who were living in assisted housing at the time of their NHANES blood draw (n = 151) with data for children who did not receive housing assistance (n = 1099). RESULTS: After adjustment, children living in assisted housing had a significantly lower geometric mean BLL (1.44 microg/dL; 95% confidence interval [CI] = 1.31, 1.57) than comparable children who did not receive housing assistance (1.79 microg/dL; 95% CI = 1.59, 2.01; P < .01). The prevalence ratio for BLLs of 3 micrograms per deciliter or higher was 0.51 (95% CI = 0.33, 0.81; P < .01). CONCLUSIONS: Children aged 1 to 5 years during 2005 to 2012 who were living in HUD-assisted housing had lower BLLs than expected given their demographic, socioeconomic, and family characteristics. (Am J Public Health. Published online ahead of print September 15, 2016: e1-e8. doi:10.2105/AJPH.2016.303432). |
Trends in timing of pregnancy awareness among US women
Branum AM , Ahrens KA . Matern Child Health J 2016 21 (4) 715-726 Objectives Early pregnancy detection is important for improving pregnancy outcomes as the first trimester is a critical window of fetal development; however, there has been no description of trends in timing of pregnancy awareness among US women. Methods We examined data from the 1995, 2002, 2006-2010 and 2011-2013 National Survey of Family Growth on self-reported timing of pregnancy awareness among women aged 15-44 years who reported at least one pregnancy in the 4 or 5 years prior to interview that did not result in induced abortion or adoption (n = 17, 406). We examined the associations between maternal characteristics and late pregnancy awareness (≥7 weeks' gestation) using adjusted prevalence ratios from logistic regression models. Gestational age at time of pregnancy awareness (continuous) was regressed over year of pregnancy conception (1990-2012) in a linear model. Results Among all pregnancies reported, gestational age at time of pregnancy awareness was 5.5 weeks (standard error = 0.04) and the prevalence of late pregnancy awareness was 23 % (standard error = 1 %). Late pregnancy awareness decreased with maternal age, was more prevalent among non-Hispanic black and Hispanic women compared to non-Hispanic white women, and for unintended pregnancies versus those that were intended (p < 0.01). Mean time of pregnancy awareness did not change linearly over a 23-year time period after adjustment for maternal age at the time of conception (p < 0.16). Conclusions for Practice On average, timing of pregnancy awareness did not change linearly during 1990-2012 among US women and occurs later among certain groups of women who are at higher risk of adverse birth outcomes. |
Pregnancy loss history at first parity and selected adverse pregnancy outcomes
Ahrens KA , Rossen LM , Branum AM . Ann Epidemiol 2016 26 (7) 474-481 e9 PURPOSE: To evaluate the association between pregnancy loss history and adverse pregnancy outcomes. METHODS: Pregnancy history was captured during a computer-assisted personal interview for 21,277 women surveyed in the National Survey of Family Growth (1995-2013). History of pregnancy loss (<20 weeks) at first parity was categorized in three ways: number of losses, maximum gestational age of loss(es), and recency of last pregnancy loss. We estimated risk ratios for a composite measure of selected adverse pregnancy outcomes (preterm, stillbirth, or low birthweight) at first parity and in any future pregnancy, separately, using predicted margins from adjusted logistic regression models. RESULTS: At first parity, compared with having no loss, having 3+ previous pregnancy losses (adjusted risk ratio (aRR) = 1.66 [95% CI = 1.13, 2.43]), a maximum gestational age of loss(es) at ≥10 weeks (aRR = 1.28 [1.04, 1.56]) or having experienced a loss 24+ months ago (aRR = 1.36 [1.10, 1.68]) were associated with increased risks of adverse pregnancy outcomes. For future pregnancies, only having a history of 3+ previous pregnancy losses at first parity was associated with increased risks (aRR = 1.97 [1.08, 3.60]). CONCLUSION: Number, gestational age, and recency of pregnancy loss at first parity were associated with adverse pregnancy outcomes in U.S. women. |
Relationship between mean leucocyte telomere length and measures of allostatic load in US reproductive-aged women, NHANES 1999-2002
Ahrens KA , Rossen LM , Simon AE . Paediatr Perinat Epidemiol 2016 30 (4) 325-35 BACKGROUND: Reproductive health disparities may be partly explained by the cumulative effects of chronic stress experienced by socially disadvantaged groups. Although, telomere length (TL) and allostatic load score have each been used as biological markers of stress, the relationship between these two measures is unknown. METHODS: We investigated the association between leucocyte TL and allostatic load score in 1503 non-pregnant women (20-44 years) participating in the National Health and Nutrition Examination Survey, 1999-2002. We constructed six different allostatic load scores using either quartile- or clinical-based cut-points for 14 biomarkers based on previously published methods. We estimated associations between TL and allostatic load scores and component biomarkers using linear regression, also assessing interactions by race/ethnicity. RESULTS: After adjustment for age, longer TL was associated with higher HDL cholesterol and lower C-reactive protein and creatinine clearance; TL was not associated with the other component biomarkers. Shorter TL was associated with higher allostatic load scores for the two clinical cut-point-based scores after adjustment for age, but not the four scores based on quartile cut-points. Significant interactions by race/ethnicity were observed for TL and HbA1c and triglycerides, but not for other component biomarkers or allostatic load scores. CONCLUSIONS: Although TL and allostatic load score are both considered measures of cumulative stress, most component biomarkers and scores using quartile-based cut-points were not associated with TL. In reproductive-aged women, allostatic load scores using clinical-based cut-points were more strongly associated with TL compared with quartile-based scores. |
Influenza vaccination among US children with asthma, 2005-2013
Simon AE , Ahrens KA , Akinbami LJ . Acad Pediatr 2015 16 (1) 68-74 BACKGROUND: Children with asthma face higher risk of complications from influenza. Trends in influenza vaccination among children with asthma are unknown. METHODS: We used 2005-2013 National Health Interview Survey data for children 2-17 years of age. We assessed, separately for children with and without asthma, any vaccination ( received August through May) during each of the 2005-2006 through 2012-2013 influenza seasons and, for the 2010-2011 through 2012-2013 seasons only, early vaccination (received August through October). We used April-July interviews each year (n=31,668) to assess vaccination during the previous influenza season. Predictive margins from logistic regression with time as the independent and vaccination status as the dependent variable were used to assess time trends. We also estimated the association between several sociodemographic variables and the likelihood of influenza vaccination. RESULTS: From 2005-2013, among children with asthma, influenza vaccination receipt increased about 3 percentage points per year (p<0.001), reaching 55% in 2012-2013. The percentage of all children with asthma vaccinated by October (early vaccination) was slightly above 30% in 2012-2013. In 2010-2013, adolescents, the uninsured, children of parents with some college education, and those living in the South and West were less likely to be vaccinated. CONCLUSION: The percentage of children 2-17 years of age with asthma receiving influenza vaccination has increased since 2004-2005, reaching approximately 55% in 2012-2013. |
Adherence to vitamin D recommendations among US infants aged 0 to 11 months, NHANES, 2009 to 2012
Ahrens KA , Rossen LM , Simon AE . Clin Pediatr (Phila) 2015 55 (6) 555-6 In 2008, the American Academy of Pediatrics (AAP) revised their recommended minimum daily intake of vitamin D for infants and children to 400 IU.1 This was based on the high prevalence of vitamin D deficiency, persistent incidence of rickets, and historical safety profile of 400 IU daily supplementation in infants and children.1 The AAP recommends that vitamin D supplementation should begin within the first few days of life and continue until the infant is consuming at least 1 liter of vitamin D–fortified formula or milk per day. Breastfed infants are at increased risk of vitamin D deficiency because human milk generally does not contain sufficient vitamin D, while infant formula is fortified to provide approximately 400 IU of vitamin D per liter (at normal dilution).2 Adherence to the revised recommended vitamin D intake guidelines has not been evaluated since enactment. | The objective of our analysis was to evaluate the percentage of US infants meeting the 2008 AAP vitamin D recommendations during 2009 to 2012. |
Use of antiepileptic medications in pregnancy in relation to risks of birth defects
Werler MM , Ahrens KA , Bosco JL , Mitchell AA , Anderka MT , Gilboa SM , Holmes LB . Ann Epidemiol 2011 21 (11) 842-850 PURPOSE: To evaluate use of specific antiepileptic drugs (AEDs) in pregnancy in relation to specific birth defects. METHODS: Using data from the National Birth Defects Prevention Study, we assessed use of AEDs and the risk of neural tube defects (NTDs), oral clefts (OCs), heart defects (HDs), hypospadias, and other major birth defects, taking specific agent, timing, and indication into consideration. RESULTS: Drug-specific increased risks were observed for valproic acid in relation to NTDs [adjusted odds ratio (aOR), 9.7;, 95% confidence interval (CI), 3.4-27.5], OCs (aOR, 4.4; 95% CI, 1.6-12.2), HDs (aOR, 2.0; 95% CI, 0.78-5.3), and hypospadias (aOR. 2.4; 95% CI, 0.62-9.0), and for carbamazapine in relation to NTDs (aOR, 5.0; 95% CI, 1.9-12.7). Epilepsy history without AED use did not seem to increase risk. CONCLUSIONS: Valproic acid, which current guidelines suggest should be avoided in pregnancy, was most notable in terms of strength and breadth of its associations. Carbamazapine was associated with NTDs, even after controlling for folic acid use. Sample sizes were still too small to adequately assess risks of less commonly used AEDs, but our findings support further study to identify lower risk options for pregnant women. |
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