Last data update: May 20, 2024. (Total: 46824 publications since 2009)
Records 1-10 (of 10 Records) |
Query Trace: Burt VL [original query] |
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Preventive aspirin and other antiplatelet medication use among U.S. adults aged ≥40 years: data from the National Health and Nutrition Examination Survey, 2011-2012
Gu Q , Dillon CF , Eberhardt MS , Wright JD , Burt VL . Public Health Rep 2015 130 (6) 643-54 OBJECTIVE: We estimated the prevalence of preventive aspirin and/or other antiplatelet medication use and the dosage of aspirin use in the U.S. adult population. METHODS: We conducted cross-sectional analyses of a representative sample (n=3,599) of U.S. adults aged ≥40 years from the National Health and Nutrition Examination Survey, 2011-2012. RESULTS: In 2011-2012, one-third of U.S. adults aged ≥40 years reported taking preventive aspirin and/or other antiplatelet medications, 97% of whom indicated preventive aspirin use. Preventive aspirin use increased with age (from 11% of those aged 40-49 years to 54% of those ≥80 years of age, p<0.001). Non-Hispanic white (35%) and black (30%) adults were more likely to take preventive aspirin than non-Hispanic Asian (20%, p<0.001) and Hispanic (22%, p=0.013) adults. Adults with, compared with those without health insurance, and adults with ≥2 doctor visits in the past year, diagnosed diabetes, hypertension, or high cholesterol were twice as likely to take preventive aspirin. Among those with cardiovascular disease, 76% reported taking preventive aspirin and/or other antiplatelet medications, of whom 91% were taking preventive aspirin. Among adults without cardiovascular disease, 28% reported taking preventive aspirin. Adherence rates to medically recommended aspirin use were 82% overall, 91% for secondary prevention, and 79% for primary prevention. Among current preventive aspirin users, 70% were taking 81 milligrams (mg) of aspirin daily and 13% were taking 325 mg of aspirin daily. CONCLUSION: The vast majority of antiplatelet therapy is preventive aspirin use. A health-care provider's recommendation to take preventive aspirin is an important determinant of current preventive aspirin use. |
Urine sodium excretion increased slightly among U.S. adults between 1988 and 2010
Pfeiffer CM , Hughes JP , Cogswell ME , Burt VL , Lacher DA , Lavoie DJ , Rabinowitz DJ , Johnson CL , Pirkle JL . J Nutr 2014 144 (5) 698-705 Little information is available on temporal trends in sodium intake in the U.S. population using urine sodium excretion as a biomarker. Our aim was to assess 1988-2010 trends in estimated 24-h urine sodium (24hUNa) excretion among U.S. adults (age 20-59 y) participating in the cross-sectional NHANES. We used subsamples from a 1988-1994 convenience sample, a 2003-2006 one-third random sample, and a 2010 one-third random sample to comply with resource constraints. We estimated 24hUNa excretion from measured sodium concentrations in spot urine samples by use of calibration equations (for men and women) derived from the International Cooperative Study on Salt, Other Factors, and Blood Pressure study. Estimated 24hUNa excretion increased over the 20-y period [1988-1994, 2003-2006, and 2010; means +/- SEMs (n): 3160 +/- 38.4 mg/d (1249), 3290 +/- 29.4 mg/d (1235), and 3290 +/- 44.4 mg/d (525), respectively; P-trend = 0.022]. We observed significantly higher mean estimated 24hUNa excretion in each survey period (P < 0.001) for men compared with women (31-33%) and for persons with a higher body mass index (BMI; 32-35% for obese vs. normal weight) or blood pressure (17-26% for hypertensive vs. normal blood pressure). After adjusting for age, sex, and race-ethnicity, temporal trends in mean estimated 24hUNa excretion remained significant (P-trend = 0.004). We observed no temporal trends in mean estimated 24hUNa excretion among BMI subgroups, nor after adjusting for BMI. Although several limitations apply to this analysis (the use of a convenience sample in 1988-1994 and using estimated 24hUNa excretion as a biomarker of sodium intake), these first NHANES data suggest that mean estimated 24hUNa excretion increased slightly in U.S. adults over the past 2 decades, and this increase may be explained by a shift in the distribution of BMI. |
Urinary excretion of sodium, potassium, and chloride, but not iodine, varies by timing of collection in a 24-hour calibration study
Wang CY , Cogswell ME , Loria CM , Chen TC , Pfeiffer CM , Swanson CA , Caldwell KL , Perrine CG , Carriquiry AL , Liu K , Sempos CT , Gillespie CD , Burt VL . J Nutr 2013 143 (8) 1276-82 Because of the logistic complexity, excessive respondent burden, and high cost of conducting 24-h urine collections in a national survey, alternative strategies to monitor sodium intake at the population level need to be evaluated. We conducted a calibration study to assess the ability to characterize sodium intake from timed-spot urine samples calibrated to a 24-h urine collection. In this report, we described the overall design and basic results of the study. Adults aged 18-39 y were recruited to collect urine for a 24-h period, placing each void in a separate container. Four timed-spot specimens (morning, afternoon, evening, and overnight) and the 24-h collection were analyzed for sodium, potassium, chloride, creatinine, and iodine. Of 481 eligible persons, 407 (54% female, 48% black) completed a 24-h urine collection. A subsample (n = 133) collected a second 24-h urine 4-11 d later. Mean sodium excretion was 3.54 +/- 1.51 g/d for males and 3.09 +/- 1.26 g/d for females. Sensitivity analysis excluding those who did not meet the expected creatinine excretion criterion showed the same results. Day-to-day variability for sodium, potassium, chloride, and iodine was observed among those collecting two 24-h urine samples (CV = 16-29% for 24-h urine samples and 21-41% for timed-spot specimens). Among all race-gender groups, overnight specimens had larger volumes (P < 0.01) and lower sodium (P < 0.01 -P = 0.26), potassium (P < 0.01), and chloride (P < 0.01) concentrations compared with other timed-spot urine samples, although the differences were not always significant. Urine creatinine and iodine concentrations did not differ by the timing of collection. The observed day-to-day and diurnal variations in sodium excretion illustrate the importance of accounting for these factors when developing calibration equations from this study. |
Trends in antihypertensive medication use and blood pressure control among United States adults with hypertension: the National Health and Nutrition Examination Survey, 2001 to 2010
Gu Q , Burt VL , Dillon CF , Yoon S . Circulation 2012 126 (17) 2105-14 BACKGROUND: The monitoring of national trends in hypertension treatment and control can provide important insight into the effectiveness of primary prevention efforts for cardiovascular disease. The objective of this study was to examine recent trends in antihypertensive medication use and its impact on blood pressure control among US adults with hypertension. METHODS AND RESULTS: A total of 9320 hypertensive people aged ≥18 years from the National Health and Nutrition Examination Survey 2001 to 2010 were included in this study. The prevalence of antihypertensive medication use increased from 63.5% in 2001 to 2002 to 77.3% in 2009 to 2010 (P(trend)<0.01). Most notably, there was a large increase in the use of multiple antihypertensive agents (from 36.8% to 47.7%, P(trend)<0.01). Overall, the use of thiazide diuretics, beta-blockers, angiotensin-converting enzyme inhibitors, and angiotensin receptor blockers increased by 23%, 57%, 31%, and 100%, respectively. In comparison with monotherapy, single-pill combinations and multiple-pill combinations were associated with 55% and 26% increased likelihoods of blood pressure control, respectively. By the 2009 to 2010 time period, 47% of all hypertensive people and 60% of treated hypertensive people had blood pressure controlled. However, higher treated but uncontrolled hypertension rates continued to persist among older Americans, non-Hispanic blacks, diabetic people, and those with chronic kidney disease. Also, Mexican Americans with hypertension were still less likely to take antihypertensive medication than non-Hispanic whites with hypertension. CONCLUSIONS: Antihypertensive medication use and blood pressure control among US adults with hypertension significantly increased over the past 10 years. Combination therapy regimens can facilitate achievement of blood pressure goals. |
Multiple imputation of missing dual-energy X-ray absorptiometry data in the National Health and Nutrition Examination Survey
Schenker N , Borrud LG , Burt VL , Curtin LR , Flegal KM , Hughes J , Johnson CL , Looker AC , Mirel L . Stat Med 2010 30 (3) 260-76 In 1999, dual-energy x-ray absorptiometry (DXA) scans were added to the National Health and Nutrition Examination Survey (NHANES) to provide information on soft tissue composition and bone mineral content. However, in 1999-2004, DXA data were missing in whole or in part for about 21 per cent of the NHANES participants eligible for the DXA examination; and the missingness is associated with important characteristics such as body mass index and age. To handle this missing-data problem, multiple imputation of the missing DXA data was performed. Several features made the project interesting and challenging statistically, including the relationship between missingness on the DXA measures and the values of other variables; the highly multivariate nature of the variables being imputed; the need to transform the DXA variables during the imputation process; the desire to use a large number of non-DXA predictors, many of which had small amounts of missing data themselves, in the imputation models; the use of lower bounds in the imputation procedure; and relationships between the DXA variables and other variables, which helped both in creating and evaluating the imputations. This paper describes the imputation models, methods, and evaluations for this publicly available data resource and demonstrates properties of the imputations via examples of analyses of the data. The analyses suggest that imputation helps to correct biases that occur in estimates based on the data without imputation, and that it helps to increase the precision of estimates as well. Moreover, multiple imputation usually yields larger estimated standard errors than those obtained with single imputation. Published in 2010 by John Wiley & Sons, Ltd. |
Prescription drug use continues to increase: U.S. prescription drug data for 2007-2008
Gu Q , Dillon CF , Burt VL . NCHS Data Brief 2010 (42) 1-8 KEY FINDINGS: Over the last 10 years, the percentage of Americans who took at least one prescription drug in the past month increased from 44% to 48%. The use of two or more drugs increased from 25% to 31%. The use of five or more drugs increased from 6% to 11%. In 2007-2008, 1 out of every 5 children and 9 out of 10 older Americans reported using at least one prescription drug in the past month. Those who were without a regular place for health care, health insurance, or prescription drug benefit had less prescription drug use compared with those who had these benefits. The most commonly used types of drugs included: asthma medicines for children, central nervous system stimulants for adolescents, antidepressants for middle-aged adults, and cholesterol lowering drugs for older Americans. |
Three-phase model harmonizes estimates of the maximal suppression of parathyroid hormone by 25-hydroxyvitamin D in persons 65 years of age and older
Durazo-Arvizu RA , Dawson-Hughes B , Sempos CT , Yetley EA , Looker AC , Cao G , Harris SS , Burt VL , Carriquiry AL , Picciano MF . J Nutr 2010 140 (3) 595-9 The concentration or threshold of 25-hydroxyvitamin D [25(OH)D] needed to maximally suppress intact serum parathyroid hormone (iPTH) has been suggested as a measure of optimal vitamin D status. Depending upon the definition of maximal suppression of iPTH and the 2-phase regression approach used, 2 distinct clusters for a single 25(OH)D threshold have been reported: 16-20 ng/mL (40-50 nmol/L) and 30-32 ng/mL (75-80 nmol/L). To rationalize the apparently disparate published results, we compared thresholds from several regression models including a 3-phase one to estimate simultaneously 2 thresholds before and after adjusting for possible confounding for age, BMI, glomerular filtration rate, dietary calcium, and season (April-September vs. October-March) within a single data set, i.e. data from the Tufts University Sites Testing Osteoporosis Prevention/Intervention Treatment study, consisting of 181 men and 206 women (total n = 387) ages 65-87 y. Plasma 25(OH)D and serum iPTH concentrations were (mean +/- SD) 22.1 +/- 7.44 ng/mL (55.25 +/- 18.6 nmol/L) and 36.6 +/- 16.03 pg/mL (3.88 +/- 1.7 pmol/L), respectively. The 3-phase model identified 2 thresholds of 12 ng/mL (30 nmol/L) and 28 ng/mL (70 nmol/L); similar results were found from the 2-phase models evaluated, i.e. 13-20 and 27-30 ng/mL (32.5-50 and 67.5-75 nmol/L) and with previous results. Adjusting for confounding did not change the results substantially. Accordingly, the 3-phase model appears to be superior to the 2-phase approach, because it simultaneously estimates the 2 threshold clusters found from the 2-phase approaches along with estimating confidence limits. If replicated, it may be of both clinical and public health importance. |
Total folate and folic acid intake from foods and dietary supplements in the United States: 2003-2006
Bailey RL , Dodd KW , Gahche JJ , Dwyer JT , McDowell MA , Yetley EA , Sempos CA , Burt VL , Radimer KL , Picciano MF . Am J Clin Nutr 2010 91 (1) 231-7 BACKGROUND: The term total folate intake is used to represent folate that occurs naturally in food as well as folic acid from fortified foods and dietary supplements. Folic acid has been referred to as a double-edged sword because of its beneficial role in the prevention of neural tube defects and yet possible deleterious effects on certain cancers and cognitive function. Previous monitoring efforts did not include folic acid from dietary supplements and are therefore not complete. OBJECTIVE: Our objective was to combine data on dietary folate (as measured by two 24-h recalls) and folic acid from dietary supplements (collected with a 30-d frequency questionnaire) with the use of the bias-corrected best power method to adjust for within-person variability. DESIGN: The National Health and Nutrition Examination Survey (NHANES) is a nationally representative, cross-sectional survey. Linear contrasts were constructed to determine differences in dietary and total folate intake for age and racial-ethnic groups by sex; prevalence of inadequate and excessive intakes is presented. RESULTS: In 2003-2006, 53% of the US population used dietary supplements; 34.5% used dietary supplements that contained folic acid. Total folate intake (in dietary folate equivalents) was higher for men (813 +/- 14) than for women (724 +/- 16) and higher for non-Hispanic whites (827 +/- 19) than for Mexican Americans (615 +/- 11) and non-Hispanic blacks (597 +/- 12); 29% of non-Hispanic black women had inadequate intakes. Total folate and folic acid intakes are highest for those aged > or =50 y, and 5% exceed the Tolerable Upper Intake Level. CONCLUSIONS: Improved total folate intake is warranted in targeted subgroups, which include women of childbearing age and non-Hispanic black women, whereas other population groups are at risk of excessive intake. |
Cardiorespiratory fitness levels among US adults 20-49 years of age: findings from the 1999-2004 National Health and Nutrition Examination Survey
Wang CY , Haskell WL , Farrell SW , Lamonte MJ , Blair SN , Curtin LR , Hughes JP , Burt VL . Am J Epidemiol 2010 171 (4) 426-35 Data from the 1999-2004 National Health and Nutrition Examination Survey were used to describe the distribution of cardiorespiratory fitness and its association with obesity and leisure-time physical activity (LTPA) for adults 20-49 years of age without physical limitations or indications of cardiovascular disease. A sample of 7,437 adults aged 20-49 years were examined at a mobile examination center. Of 4,860 eligible for a submaximal treadmill test, 3,250 completed the test and were included in the analysis. The mean maximal oxygen uptake ( max) was estimated as 44.5, 42.8, and 42.2 mL/kg/minute for men 20-29, 30-39, and 40-49 years of age, respectively. For women, it was 36.5, 35.4, and 34.4 mL/kg/minute for the corresponding age groups. Non-Hispanic black women had lower fitness levels than did non-Hispanic white and Mexican-American women. Regardless of gender or race/ethnicity, people who were obese had a significantly lower estimated maximal oxygen uptake than did nonobese adults. Furthermore, a positive association between fitness level and LTPA participation was observed for both men and women. These results can be used to track future population assessments and to evaluate interventions. The differences in fitness status among population subgroups and by obesity status or LTPA can also be used to develop health policies and targeted educational campaigns. |
Association of hypertension treatment and control with all-cause and cardiovascular disease mortality among US adults with hypertension
Gu Q , Dillon CF , Burt VL , Gillum RF . Am J Hypertens 2009 23 (1) 38-45 BACKGROUND: Clinical trials have provided convincing evidence that blood pressure (BP) lowering treatment reduces the risk of cardiovascular disease (CVD) and total mortality. OBJECTIVE: to examine the association of hypertension treatment, control, and BP indexes with all-cause and cardiovascular mortality among US adults with hypertension. METHODS: Persons aged ≥18 years from the Third National Health and Nutrition Examination Survey (NHANES III) were identified as hypertensives based on a BP ≥140/90 mm Hg or current treatment for hypertension. Vital status in 2006 was ascertained by passive follow-up using the National Death Index. Cox regression models were used to assess correlates of survival. RESULTS: At baseline, 52% of hypertensive adults reported currently taking prescription medicine for high BP and 38% of treated persons had BP controlled. Compared to treated controlled hypertensives, treated uncontrolled hypertensives had a 1.57-fold (95% confidence interval (CI) 1.28-1.91) and 1.74-fold (95% CI 1.36-2.22) risk of all-cause and cardiovascular mortality; untreated hypertensives had a 1.34-fold (95% CI 1.12-1.62) and 1.37-fold (95% CI 1.04-1.81) risk of all-cause and cardiovascular mortality, respectively. The association persisted after further excluding persons with pre-existing hypertension comorbidities. Mortality risk was linearly increased with systolic BP (SBP), pulse pressure (PP), and mean arterial pressure (MBP), whereas diastolic BP (DBP) was not a significant predictor of cardiovascular mortality overall. No significant associations were observed between drug classes and mortality risk. CONCLUSIONS: This study indicates that uncontrolled and untreated hypertension was associated with increased risk of total and cardiovascular mortality among the general hypertensive population.American Journal of Hypertension 2009; doi:10.1038/ajh.2009.191. |
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