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Tabet M, Banna S, Luong L, Kirby R, Chang JJ. Pregnancy Outcomes after Preeclampsia: The Effects of Interpregnancy Weight Change. Am J Perinatol 2021; 38:1393-1402. [PMID: 32521560 DOI: 10.1055/s-0040-1713000] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
OBJECTIVE This study aimed to examine the effects of interpregnancy weight change on pregnancy outcomes, including recurrent preeclampsia, preterm birth, small-for-gestational age (SGA), large-for-gestational age (LGA), and cesarean delivery, among women with a history of preeclampsia. We also evaluated whether these associations were modified by prepregnancy body mass index (BMI) category in the first pregnancy (BMI < 25 vs. ≥25 kg/m2) and if associations were present among women who maintained a healthy BMI category in both pregnancies. STUDY DESIGN We conducted a population-based retrospective cohort study including 15,108 women who delivered their first two nonanomalous singleton live births in Missouri (1989-2005) and experienced preeclampsia in the first pregnancy. We performed Poisson regression with robust error variance to estimate relative risks and 95% confidence intervals for outcomes of interest after controlling for potential confounders. RESULTS Interpregnancy weight gain was associated with increased risk of recurrent preeclampsia, LGA, and cesarean delivery. These risks increased in a "dose-response" manner with increasing magnitude of interpregnancy weight gain and were generally more pronounced among women who were underweight or normal weight in the first pregnancy. Interpregnancy weight loss exceeding 1 BMI unit was associated with increased risk of SGA among underweight and normal weight women, while interpregnancy weight loss exceeding 2 BMI units was associated with reduced risk of recurrent preeclampsia among overweight and obese women. CONCLUSION Even small changes in interpregnancy weight may significantly affect pregnancy outcomes among formerly preeclamptic women. Appropriate weight management between pregnancies has the potential to attenuate such risks. KEY POINTS · Interpregnancy weight change among formerly preeclamptic women significantly affects pregnancy outcomes.. · Interpregnancy weight gain is associated with increased risk of recurrent preeclampsia, large-for-gestational-age and cesarean delivery.. · Interpregnancy weight loss is associated with increased risk of small-for-gestational age and recurrent preeclampsia..
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Affiliation(s)
- Maya Tabet
- Department of Epidemiology and Biostatistics, College for Public Health and Social Justice, Saint Louis University, Saint Louis, Missouri
| | - Soumya Banna
- School of Medicine, Saint Louis University, Saint Louis, Missouri
| | - Lan Luong
- Department of Epidemiology and Biostatistics, College for Public Health and Social Justice, Saint Louis University, Saint Louis, Missouri
| | - Russell Kirby
- Department of Community and Family Health, College of Public Health, University of South Florida, Tampa, Florida
| | - Jen Jen Chang
- Department of Epidemiology and Biostatistics, College for Public Health and Social Justice, Saint Louis University, Saint Louis, Missouri
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Petersen JM, Ranker LR, Barnard-Mayers R, MacLehose RF, Fox MP. A systematic review of quantitative bias analysis applied to epidemiological research. Int J Epidemiol 2021; 50:1708-1730. [PMID: 33880532 DOI: 10.1093/ije/dyab061] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/05/2021] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Quantitative bias analysis (QBA) measures study errors in terms of direction, magnitude and uncertainty. This systematic review aimed to describe how QBA has been applied in epidemiological research in 2006-19. METHODS We searched PubMed for English peer-reviewed studies applying QBA to real-data applications. We also included studies citing selected sources or which were identified in a previous QBA review in pharmacoepidemiology. For each study, we extracted the rationale, methodology, bias-adjusted results and interpretation and assessed factors associated with reproducibility. RESULTS Of the 238 studies, the majority were embedded within papers whose main inferences were drawn from conventional approaches as secondary (sensitivity) analyses to quantity-specific biases (52%) or to assess the extent of bias required to shift the point estimate to the null (25%); 10% were standalone papers. The most common approach was probabilistic (57%). Misclassification was modelled in 57%, uncontrolled confounder(s) in 40% and selection bias in 17%. Most did not consider multiple biases or correlations between errors. When specified, bias parameters came from the literature (48%) more often than internal validation studies (29%). The majority (60%) of analyses resulted in >10% change from the conventional point estimate; however, most investigators (63%) did not alter their original interpretation. Degree of reproducibility related to inclusion of code, formulas, sensitivity analyses and supplementary materials, as well as the QBA rationale. CONCLUSIONS QBA applications were rare though increased over time. Future investigators should reference good practices and include details to promote transparency and to serve as a reference for other researchers.
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Affiliation(s)
- Julie M Petersen
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
| | - Lynsie R Ranker
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
| | - Ruby Barnard-Mayers
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
| | - Richard F MacLehose
- Division of Epidemiology and Community Health, University of Minnesota, School of Public Health, Minneapolis, MN, USA
| | - Matthew P Fox
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA.,Department of Global Health, Boston University School of Public Health, Boston, MA, USA
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Josberger RE, Wu M, Nichols EL. Birth Certificate Validity and the Impact on Primary Cesarean Section Quality Measure in New York State. J Community Health 2018; 44:222-229. [DOI: 10.1007/s10900-018-0577-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Tabet M, Harper LM, Flick LH, Chang JJ. Gestational Weight Gain in the First Two Pregnancies and Perinatal Outcomes in the Second Pregnancy. Paediatr Perinat Epidemiol 2017; 31:304-313. [PMID: 28543169 DOI: 10.1111/ppe.12364] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Gestational Weight Gain (GWG) below or above the Institute of Medicine (IOM) recommendations increases the risk of adverse pregnancy outcomes. However, it remains unknown whether the risk of adverse outcomes is affected by GWG in a previous pregnancy. We examined associations between GWG in the index (second) pregnancy and pregnancy outcomes, including preterm delivery and small for gestational age (SGA), while taking into consideration GWG in the first pregnancy. METHODS In a population-based cohort study (n = 210 564), using the Missouri maternally-linked birth registry (1989-2005), we used multivariable Poisson regression with robust error variance stratified by prepregnancy body mass index (BMI) to evaluate associations between GWG in the index pregnancy and a composite indicator of GWG in the first and second pregnancies and our outcomes of interest, after controlling for sociodemographic and pregnancy-related confounders. RESULTS Associations between GWG in the index pregnancy and pregnancy outcomes were moderated by GWG in the first pregnancy. Despite having GWG within recommendations in the index pregnancy, women had increased risk of preterm delivery and SGA if they had suboptimal GWG in their first pregnancy. Also, women having suboptimal GWG in the index pregnancy had increased risk of preterm delivery only if their GWG in the first pregnancy was also suboptimal. CONCLUSIONS The observation that women who have GWG within recommendations in a current pregnancy may still have increased risk of adverse outcomes if they had suboptimal GWG in the first pregnancy has considerable clinical and public health implications.
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Affiliation(s)
- Maya Tabet
- Department of Epidemiology, Saint Louis University College for Public Health and Social Justice, Saint Louis, MO
| | - Lorie M Harper
- Department of Obstetrics and Gynecology, Washington University in Saint Louis, Saint Louis, MO
| | - Louise H Flick
- Department of Epidemiology, Saint Louis University College for Public Health and Social Justice, Saint Louis, MO
| | - Jen Jen Chang
- Department of Epidemiology, Saint Louis University College for Public Health and Social Justice, Saint Louis, MO
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Tabet M, Jakhar S, Williams CA, Rawat U, Hailegiorgis YD, Flick LH, Chang JJ. Racial/Ethnic Differences in Correlates of Spontaneous and Medically-Indicated Late Preterm Births among Adolescents. J Pediatr Adolesc Gynecol 2017; 30:63-70. [PMID: 27543000 DOI: 10.1016/j.jpag.2016.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 08/03/2016] [Accepted: 08/06/2016] [Indexed: 11/16/2022]
Abstract
STUDY OBJECTIVE To investigate the racial/ethnic differences in the correlates of spontaneous and medically-indicated late preterm birth (LPTB), defined as deliveries between 34 0/7 and 36 6/7 weeks gestation, among US adolescents. DESIGN Population-based, retrospective cohort study. SETTING Births in the United States to adolescents in 2012. PARTICIPANTS Adolescents (younger than 20 years; n = 171,573) who delivered nonanomalous singleton first births between 34 and 44 weeks of gestation. INTERVENTIONS AND MAIN OUTCOME MEASURES Bivariate and multivariable logistic regression were used to evaluate the associations between maternal risk factors and spontaneous and medically-indicated LPTB, stratified according to maternal race/ethnicity. RESULTS Risk factors for spontaneous LPTB included single marital status among Asian adolescents; no insurance coverage among whites, Asian, and Hispanic adolescents; inadequate prenatal care among all racial/ethnic groups except American Indian, and adequate plus prenatal care among all races/ethnicities; prenatal smoking among whites and black adolescents; insufficient gestational weight gain among all racial/ethnic groups except American Indian; and prepregnancy underweight among white, black, and Hispanic adolescents. Risk factors for medically-indicated LPTB included inadequate prenatal care among white, black, and Hispanic adolescents, and adequate plus prenatal care among all racial/ethnic groups except Asian; insufficient gestational weight gain among white, black, and Hispanic adolescents; and prepregnancy overweight and obesity among white, black, and Hispanic adolescents. CONCLUSION Our results show racial/ethnic differences in the correlates of spontaneous and medically-indicated LPTB among US adolescents and support the need for risk-specific interventions among different racial/ethnic groups.
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Affiliation(s)
- M Tabet
- Department of Epidemiology, College for Public Health and Social Justice, Saint Louis University, Saint Louis, Missouri
| | - S Jakhar
- Department of Epidemiology, College for Public Health and Social Justice, Saint Louis University, Saint Louis, Missouri
| | - C A Williams
- Department of Epidemiology, College for Public Health and Social Justice, Saint Louis University, Saint Louis, Missouri
| | - U Rawat
- Department of Epidemiology, College for Public Health and Social Justice, Saint Louis University, Saint Louis, Missouri
| | - Y D Hailegiorgis
- Department of Epidemiology, College for Public Health and Social Justice, Saint Louis University, Saint Louis, Missouri
| | - L H Flick
- Department of Epidemiology, College for Public Health and Social Justice, Saint Louis University, Saint Louis, Missouri
| | - J J Chang
- Department of Epidemiology, College for Public Health and Social Justice, Saint Louis University, Saint Louis, Missouri.
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Glanz JM, Newcomer SR, Jackson ML, Omer SB, Bednarczyk RA, Shoup JA, DeStefano F, Daley MF, Goddard K, Panneton M, Groom H, Plotkin SA, Orenstein WA, Marcuse EK, Brookhart MA, Kulldorff M, Shimabukuro T, McNeil M, Gee J, Weintraub E, Sukumaran L. White Paper on studying the safety of the childhood immunization schedule in the Vaccine Safety Datalink. Vaccine 2016; 34 Suppl 1:A1-A29. [DOI: 10.1016/j.vaccine.2015.10.082] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 10/06/2015] [Indexed: 10/22/2022]
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Quantifying and Adjusting for Disease Misclassification Due to Loss to Follow-Up in Historical Cohort Mortality Studies. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2015; 12:12834-46. [PMID: 26501295 PMCID: PMC4627002 DOI: 10.3390/ijerph121012834] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Revised: 09/22/2015] [Accepted: 10/08/2015] [Indexed: 11/16/2022]
Abstract
The purpose of this analysis was to quantify and adjust for disease misclassification from loss to follow-up in a historical cohort mortality study of workers where exposure was categorized as a multi-level variable. Disease classification parameters were defined using 2008 mortality data for the New Zealand population and the proportions of known deaths observed for the cohort. The probability distributions for each classification parameter were constructed to account for potential differences in mortality due to exposure status, gender, and ethnicity. Probabilistic uncertainty analysis (bias analysis), which uses Monte Carlo techniques, was then used to sample each parameter distribution 50,000 times, calculating adjusted odds ratios (ORDM-LTF) that compared the mortality of workers with the highest cumulative exposure to those that were considered never-exposed. The geometric mean ORDM-LTF ranged between 1.65 (certainty interval (CI): 0.50-3.88) and 3.33 (CI: 1.21-10.48), and the geometric mean of the disease-misclassification error factor (εDM-LTF), which is the ratio of the observed odds ratio to the adjusted odds ratio, had a range of 0.91 (CI: 0.29-2.52) to 1.85 (CI: 0.78-6.07). Only when workers in the highest exposure category were more likely than those never-exposed to be misclassified as non-cases did the ORDM-LTF frequency distributions shift further away from the null. The application of uncertainty analysis to historical cohort mortality studies with multi-level exposures can provide valuable insight into the magnitude and direction of study error resulting from losses to follow-up.
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Tabet M, Flick LH, Tuuli MG, Macones GA, Chang JJ. Prepregnancy body mass index in a first uncomplicated pregnancy and outcomes of a second pregnancy. Am J Obstet Gynecol 2015; 213:548.e1-7. [PMID: 26103529 DOI: 10.1016/j.ajog.2015.06.031] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Revised: 05/09/2015] [Accepted: 06/12/2015] [Indexed: 11/29/2022]
Abstract
OBJECTIVE This study examined the effect of body mass index (BMI) before a first uncomplicated pregnancy on maternal and fetal outcomes in a subsequent pregnancy, including preterm births, preeclampsia, cesarean delivery, small for gestational age, large for gestational age, and neonatal deaths. STUDY DESIGN We conducted a population-based cohort study (n = 121,092) using the Missouri maternally linked birth registry (1989 through 2005). Multivariable binary logistic regression models were fit to estimate odds ratios and 95% confidence intervals for the parameters of interest after controlling for sociodemographic and pregnancy-related confounders in the second pregnancy. RESULTS Compared to women with a normal BMI in their first pregnancy, those who were underweight prepregnancy had increased odds for preterm birth by 20% and small for gestational age by 40% in their second pregnancy, while those with prepregnancy obesity had increased odds for large for gestational age, preeclampsia, cesarean delivery, and neonatal deaths in their second pregnancy by 54%, 156%, 85%, and 37%, respectively. CONCLUSION Women starting a first pregnancy with suboptimal BMI may be at risk of adverse maternal and fetal outcomes in a subsequent pregnancy, even if their first pregnancy was uncomplicated or if they reached a normal weight by their second pregnancy. The long-term consequences of suboptimal BMI carry considerable public health implications.
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Affiliation(s)
- Maya Tabet
- Department of Epidemiology, College for Public Health and Social Justice, Saint Louis University, St. Louis, MO.
| | - Louise H Flick
- Department of Epidemiology, College for Public Health and Social Justice, Saint Louis University, St. Louis, MO
| | - Methodius G Tuuli
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, School of Medicine, Washington University in St. Louis, St. Louis, MO
| | - George A Macones
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, School of Medicine, Washington University in St. Louis, St. Louis, MO
| | - Jen Jen Chang
- Department of Epidemiology, College for Public Health and Social Justice, Saint Louis University, St. Louis, MO
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Funk MJ, Landi SN. Misclassification in administrative claims data: quantifying the impact on treatment effect estimates. CURR EPIDEMIOL REP 2015. [PMID: 26085977 DOI: 10.1007/s40471‐014‐0027‐z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Misclassification is present in nearly every epidemiologic study, yet is rarely quantified in analysis in favor of a focus on random error. In this review, we discuss past and present wisdom on misclassification and what measures should be taken to quantify this influential bias, with a focus on bias in pharmacoepidemiologic studies. To date, pharmacoepidemiology primarily utilizes data obtained from administrative claims, a rich source of prescription data but susceptible to bias from unobservable factors including medication sample use, medications filled but not taken, health conditions that are not reported in the administrative billing data, and inadequate capture of confounders. Due to the increasing focus on comparative effectiveness research, we provide a discussion of misclassification in the context of an active comparator, including a demonstration of treatment effects biased away from the null in the presence of nondifferential misclassification. Finally, we highlight recently developed methods to quantify bias and offer these methods as potential options for strengthening the validity and quantifying uncertainty of results obtained from pharmacoepidemiologic research.
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Affiliation(s)
- Michele Jonsson Funk
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill NC
| | - Suzanne N Landi
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill NC
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Funk MJ, Landi SN. Misclassification in administrative claims data: quantifying the impact on treatment effect estimates. CURR EPIDEMIOL REP 2014; 1:175-185. [PMID: 26085977 PMCID: PMC4465810 DOI: 10.1007/s40471-014-0027-z] [Citation(s) in RCA: 128] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Misclassification is present in nearly every epidemiologic study, yet is rarely quantified in analysis in favor of a focus on random error. In this review, we discuss past and present wisdom on misclassification and what measures should be taken to quantify this influential bias, with a focus on bias in pharmacoepidemiologic studies. To date, pharmacoepidemiology primarily utilizes data obtained from administrative claims, a rich source of prescription data but susceptible to bias from unobservable factors including medication sample use, medications filled but not taken, health conditions that are not reported in the administrative billing data, and inadequate capture of confounders. Due to the increasing focus on comparative effectiveness research, we provide a discussion of misclassification in the context of an active comparator, including a demonstration of treatment effects biased away from the null in the presence of nondifferential misclassification. Finally, we highlight recently developed methods to quantify bias and offer these methods as potential options for strengthening the validity and quantifying uncertainty of results obtained from pharmacoepidemiologic research.
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Affiliation(s)
- Michele Jonsson Funk
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill NC
| | - Suzanne N Landi
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill NC
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Pitfalls abound when using administrative health databases. J Pediatr Surg 2014; 49:845. [PMID: 24851782 DOI: 10.1016/j.jpedsurg.2013.12.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Accepted: 12/11/2013] [Indexed: 10/25/2022]
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Shew SB. Reply to letter to the editor. J Pediatr Surg 2014; 49:845-7. [PMID: 24851783 DOI: 10.1016/j.jpedsurg.2014.02.086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 02/19/2014] [Indexed: 11/25/2022]
Affiliation(s)
- Stephen B Shew
- Mattei Children's Hospital at UCLA, Department of Pediatric Surgery, Los Angeles, CA 90095-9818, USA.
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Planned home or hospital delivery: what outcomes provide valid comparisons? Am J Obstet Gynecol 2014; 210:488-9. [PMID: 24334201 DOI: 10.1016/j.ajog.2013.12.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Accepted: 12/10/2013] [Indexed: 11/20/2022]
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Searles Nielsen S, Dills RL, Glass M, Mueller BA. Accuracy of prenatal smoking data from Washington State birth certificates in a population-based sample with cotinine measurements. Ann Epidemiol 2013; 24:236-9. [PMID: 24461931 DOI: 10.1016/j.annepidem.2013.12.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2013] [Revised: 12/10/2013] [Accepted: 12/23/2013] [Indexed: 11/16/2022]
Abstract
PURPOSE To assess the accuracy of smoking data in contemporary U.S. birth certificates. METHODS We compared data on prenatal smoking as reported on Washington State birth certificates to cotinine measured in archived newborn screening dried blood spots for 200 infants born in 2007 (100 randomly selected from births to self-reported nonsmokers and 100 born to self-reported smokers). We estimated the sensitivity of the birth certificate data to identify prenatal smokers and the precision with which self-identified third trimester smokers report smoking levels. RESULTS Infants born to two (2%) mothers who reported they did not smoke during the pregnancy had whole blood cotinine concentrations consistent with active smoking by the mother (sensitivity 85%). Sensitivity of the birth certificate to identify reported smokers who continued to smoke throughout pregnancy was similar (89%). Among self-identified third trimester smokers whose infants' specimens were collected shortly after delivery, Spearman rho between infant cotinine and maternal-reported cigarettes/day in the third trimester was 0.54. CONCLUSIONS Birth certificates may represent a viable option for assessing prenatal smoking status, and possibly smoking cessation and level among smokers, in epidemiologic studies sufficiently powered to overcome a moderate amount of exposure measurement error.
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Affiliation(s)
- Susan Searles Nielsen
- Fred Hutchinson Cancer Research Center, Public Health Sciences Division, Seattle, WA.
| | - Russell L Dills
- Environmental Health Laboratory and Trace Organics Analysis Center, Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA
| | - Michael Glass
- Washington State Department of Health, Newborn Screening Program, Shoreline, WA
| | - Beth A Mueller
- Fred Hutchinson Cancer Research Center, Public Health Sciences Division, Seattle, WA
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