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Schreuder A, Mokadem I, Smeets NJL, Spaanderman MEA, Roeleveld N, Lupattelli A, van Gelder MMHJ. Associations of periconceptional oral contraceptive use with pregnancy complications and adverse birth outcomes. Int J Epidemiol 2023; 52:1388-1399. [PMID: 37040615 PMCID: PMC10555752 DOI: 10.1093/ije/dyad045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 03/23/2023] [Indexed: 04/13/2023] Open
Abstract
BACKGROUND Periconceptional use of oral contraceptives (OCs) has been reported to increase risks of pregnancy complications and adverse birth outcomes, but risks are suggested to differ depending on the timing of discontinuation, amount of oestrogen and progestin content. METHODS Prospective cohort study among 6470 pregnancies included in the PRegnancy and Infant DEvelopment (PRIDE) Study in 2012-19. Exposure was defined as any reported use of OCs within 12 months pre-pregnancy or after conception. Outcomes of interest were gestational diabetes, gestational hypertension, pre-eclampsia, pre-term birth, low birthweight and small for gestational age (SGA). Multivariable Poisson regression using stabilized inverse probability weighting estimated relative risks (RRs) with 95% CIs. RESULTS Any periconceptional OC use was associated with increased risks of pre-eclampsia (RR 1.38, 95% CI 0.99-1.93), pre-term birth (RR 1.38, 95% CI 1.09-1.75) and low birthweight (RR 1.45, 95% CI 1.10-1.92), but not with gestational hypertension (RR 1.09, 95% CI 0.91-1.31), gestational diabetes (RR 1.02, 95% CI 0.77-1.36) and SGA (RR 0.96, 95% CI 0.75-1.21). Associations with pre-eclampsia were strongest for discontinuation 0-3 months pre-pregnancy, for OCs containing ≥30 µg oestrogen and for first- or second-generation OCs. Pre-term birth and low birthweight were more likely to occur when OCs were discontinued 0-3 months pre-pregnancy, when using OCs containing <30 µg oestrogen and when using third-generation OCs. Associations with SGA were observed for OCs containing <30 µg oestrogen and for third- or fourth-generation OCs. CONCLUSIONS Periconceptional OC use, particularly those containing oestrogen, was associated with increased risks of pre-eclampsia, pre-term birth, low birthweight and SGA.
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Affiliation(s)
- Anton Schreuder
- Department of Medical Imaging, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Ibtissam Mokadem
- Department for Health Evidence, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Nori J L Smeets
- Department of Pharmacology and Toxicology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Marc E A Spaanderman
- Department of Obstetrics and Gynaecology, Radboud University Medical Center, Nijmegen, The Netherlands
- Department of Obstetrics and Gynaecology, School for Oncology and Developmental Biology (GROW), Maastricht University Medical Center, Maastricht, The Netherlands
| | - Nel Roeleveld
- Department for Health Evidence, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Angela Lupattelli
- PharmacoEpidemiology and Drug Safety Research Group, School of Pharmacy, and PharmaTox Strategic Research Initiative, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
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Ogbutor C, Mishaw SM, Mulla ZD. Mediation Analysis of Maternal Smoking, Gestational Age, and Birth Weight on the Texas-Mexico Border. South Med J 2023; 116:478-481. [PMID: 37263610 DOI: 10.14423/smj.0000000000001566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVES Published data on the indirect effect of maternal smoking on birth weight as mediated by gestational age in Hispanic populations are lacking. Our goal was to conduct such a mediation analysis using data from El Paso County, Texas. METHODS El Paso County is located on the US-Mexico border. A simple mediation analysis was conducted using year 2010 El Paso County birth certificate data. The SAS macro PROCESS 3.5.3 was used to estimate the direct and indirect effects of active maternal smoking (by trimester) on birth weight (in grams) in the setting of linear regression. The single mediator was gestational age in weeks. A direct or indirect effect was deemed to be present if the 95% confidence limits (CLs) excluded 0. Analyses were adjusted for multiple variables, including maternal prepregnancy body mass index. The indirect effect was reported along with a 95% bootstrap CL. RESULTS A total of 16,654 singleton births were included in the cohort. The majority of the mothers were White Hispanic (87.2%). The mean (standard deviation) birth weight was 3198.6 g (517.2). A direct effect of maternal smoking during each trimester on birth weight was detected. An indirect effect of maternal smoking on birth weight was not detected in any of the trimesters. In adjusted analyses for the third trimester, the indirect effect for every 1-U increase in the mean number of cigarettes smoked per day was -4.18 (95% bootstrap CL -10.64 to 1.99). CONCLUSIONS In our large, predominantly Hispanic cohort, it appears that gestational age is not a mediator of the effect of maternal smoking on birth weight. Future studies in our population should explore other possible mediators of this association.
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van Gelder MMHJ, Beekers P, van Rijt-Weetink YRJ, van Drongelen J, Roeleveld N, Smits LJM. Associations Between Late-Onset Preeclampsia and the Use of Calcium-Based Antacids and Proton Pump Inhibitors During Pregnancy: A Prospective Cohort Study. Clin Epidemiol 2022; 14:1229-1240. [PMID: 36325201 PMCID: PMC9621001 DOI: 10.2147/clep.s382303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 10/11/2022] [Indexed: 11/24/2022] Open
Abstract
Purpose Preeclampsia is a leading cause of maternal morbidity and mortality. Calcium-based antacids and proton pump inhibitors (PPIs) are commonly used during pregnancy to treat symptoms of gastroesophageal reflux disease. Both have been hypothesized to reduce the risk of preeclampsia. We determined associations of calcium-based antacid and PPI use during pregnancy with late-onset preeclampsia (≥34 weeks of gestation), taking into account dosage and timing of use. Patients and Methods We included 9058 pregnant women participating in the PRIDE Study (2012–2019) or The Dutch Pregnancy Drug Register (2014–2019), two prospective cohorts in The Netherlands. Data were collected through web-based questionnaires and obstetric records. We estimated risk ratios (RRs) for late-onset preeclampsia for any use and trajectories of calcium-based antacid and PPI use before gestational day 238, and hazard ratios (HRs) for time-varying exposures after gestational day 237. Results Late-onset preeclampsia was diagnosed in 2.6% of pregnancies. Any use of calcium-based antacids (RR 1.2 [95% CI 0.9–1.6]) or PPIs (RR 1.4 [95% CI 0.8–2.4]) before gestational day 238 was not associated with late-onset preeclampsia. Use of low-dose calcium-based antacids in gestational weeks 0–16 (<1 g/day; RR 1.8 [95% CI 1.1–2.9]) and any use of PPIs in gestational weeks 17–33 (RR 1.6 [95% CI 1.0–2.8]) seemed to increase risks of late-onset preeclampsia. We did not observe associations between late-onset preeclampsia and use of calcium-based antacids (HR 1.0 [95% CI 0.6–1.5]) and PPIs (HR 1.4 [95% CI 0.7–2.9]) after gestational day 237. Conclusion In this prospective cohort study, use of calcium-based antacids and PPIs during pregnancy was not found to reduce the risk of late-onset preeclampsia.
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Affiliation(s)
- Marleen M H J van Gelder
- Department for Health Evidence, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, the Netherlands,Correspondence: Marleen MHJ van Gelder, Department for Health Evidence (HP 133), Radboud University Medical Center, P.O. Box 9101, Nijmegen, 6500 HB, the Netherlands, Tel +31 24 3615305, Fax +31 24 3613505, Email
| | - Pim Beekers
- Department for Health Evidence, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, the Netherlands,National Health Care Institute, Diemen, the Netherlands
| | | | - Joris van Drongelen
- Department of Obstetrics & Gynecology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Nel Roeleveld
- Department for Health Evidence, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Luc J M Smits
- Department of Epidemiology, CAPHRI Care and Public Health Research Institute, Maastricht University, Maastricht, the Netherlands
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Singh J, Scime NV, Chaput KH. Association of Caesarean delivery and breastfeeding difficulties during the delivery hospitalization: a community-based cohort of women and full-term infants in Alberta, Canada. CANADIAN JOURNAL OF PUBLIC HEALTH = REVUE CANADIENNE DE SANTE PUBLIQUE 2022; 114:104-112. [PMID: 35902540 PMCID: PMC9849537 DOI: 10.17269/s41997-022-00666-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 06/20/2022] [Indexed: 01/22/2023]
Abstract
OBJECTIVE Breastfeeding difficulties are the most common reason for breastfeeding cessation, particularly in the early postpartum. Caesarean delivery is associated with earlier breastfeeding cessation than is the case with vaginal delivery, but differences in breastfeeding difficulties by mode of delivery have not been thoroughly examined. Our objective was to explore the association between Caesarean delivery and types of breastfeeding difficulties. METHODS We conducted a secondary analysis of data from a prospective cohort study of mothers who delivered full-term, singleton infants in Calgary, Alberta, Canada (N = 418). Women completed self-report questionnaires during the delivery hospitalization. Mode of delivery was defined as vaginal or Caesarean, and further classified as planned or unplanned Caesarean. Breastfeeding difficulties were measured using the Breastfeeding Experiences Scale and operationalized with binary variables for presence of various types of maternal (i.e. physical, supply, social) and infant (i.e. latch, behaviour/health) difficulties that were reported as moderate to unbearable. Multivariable logistic regression was used to estimate adjusted odds ratios (AORs) and 95% confidence intervals (CIs). RESULTS Overall, 37.1% of women had a Caesarean delivery and 80.9% experienced a breastfeeding difficulty during the delivery hospitalization. Of the difficulties studied, Caesarean delivery was significantly associated with low milk supply (AOR = 1.62, 95% CI = 1.16-2.28) and infant behaviour/health difficulties (AOR = 1.33, 95% CI = 1.01-1.75). The association with low milk supply persisted when examining both planned (AOR = 2.42, 95% CI = 1.19-4.92) and unplanned (AOR = 2.21, 95% CI = 1.16-4.22) Caesarean deliveries. CONCLUSION Mothers who deliver by Caesarean have higher odds of reporting low milk supply and infant behaviour/health difficulties than women who deliver vaginally.
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Affiliation(s)
- Joyce Singh
- Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, AB Canada
| | - Natalie V. Scime
- Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, AB Canada
| | - Kathleen H. Chaput
- Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, AB Canada ,Department of Obstetrics & Gynecology, Cumming School of Medicine, University of Calgary, Calgary, AB Canada
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Barry Y, Le Strat Y, Azria E, Gorza M, Pilkington H, Vandentorren S, Gallay A, Regnault N. Ability of municipality-level deprivation indices to capture social inequalities in perinatal health in France: A nationwide study using preterm birth and small for gestational age to illustrate their relevance. BMC Public Health 2022; 22:919. [PMID: 35534845 PMCID: PMC9082984 DOI: 10.1186/s12889-022-13246-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 04/04/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Evidence-based policy-making to reduce perinatal health inequalities requires an accurate measure of social disparities. We aimed to evaluate the relevance of two municipality-level deprivation indices (DIs), the French-Deprivation-Index (FDep) and the French-European-Deprivation-Index (FEDI) in perinatal health through two key perinatal outcomes: preterm birth (PTB) and small-for-gestational-age (SGA). METHODS We used two data sources: The French National Perinatal Surveys (NPS) and the French national health data system (SNDS). Using the former, we compared the gradients of the associations between individual socioeconomic characteristics (educational level and income) and "PTB and SGA" and associations between municipality-level DIs (Q1:least deprived; Q5:most deprived) and "PTB and SGA". Using the SNDS, we then studied the association between each component of the two DIs (census data, 2015) and "PTB and SGA". Adjusted odds ratios (aOR) were estimated using multilevel logistic regression with random intercept at the municipality level. RESULTS In the NPS (N = 26,238), PTB and SGA were associated with two individual socioeconomic characteristics: maternal educational level (≤ lower secondary school vs. ≥ Bachelor's degree or equivalent, PTB: aOR = 1.43 [1.22-1.68], SGA: (1.31 [1.61-1.49]) and household income (< 1000 € vs. ≥ 3000 €, PTB: 1.55 [1.25-1.92], SGA: 1.69 [1.45-1.98]). For both FDep and FEDI, PTB and SGA were more frequent in deprived municipalities (Q5: 7.8% vs. Q1: 6.3% and 9.0% vs. 5.9% for PTB, respectively, and 12.0% vs. 10.3% and 11.9% vs. 10.2% for SGA, respectively). However, after adjustment, neither FDep nor FEDI showed a significant gradient with PTB or SGA. In the SNDS (N = 726,497), no FDep component, and only three FEDI components were significantly associated (specifically, the % of the population with ≤ lower secondary level of education with both outcomes (PTB: 1.5 [1.15-1.96]); SGA: 1.25 [1.03-1.51]), the % of overcrowded (i.e., > 1 person per room) houses (1.63 [1.15-2.32]) with PTB only, and unskilled farm workers with SGA only (1.52 [1.29-1.79]). CONCLUSION Some components of FDep and FEDI were less relevant than others for capturing ecological inequalities in PTB and SGA. Results varied for each DI and perinatal outcome studied. These findings highlight the importance of testing DI relevance prior to examining perinatal health inequalities, and suggest the need to develop DIs that are suitable for pregnant women. .
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Affiliation(s)
- Yaya Barry
- Non-Communicable Diseases and Trauma Division, Santé Publique France, the French National Public Health Agency, 12, rue du Val d'Osne, 94415, Saint-Maurice, France.
| | - Yann Le Strat
- Data Science Division, Santé Publique France, the French National Public Health Agency, Saint-Maurice, France
| | - Elie Azria
- Perinatal and Paediatric Epidemiology (EPOPé) Research Team, CRESS U1153, INSERM, Université de Paris, Paris, Obstetrical, France.,Maternity Unit, Paris Saint Joseph Hospital, DHU Risks in Pregnancy, Paris Descartes University, Paris, France
| | - Maud Gorza
- Health Promotion and Prevention Division, Santé Publique France, the French National Public Health Agency, Saint-Maurice, France
| | - Hugo Pilkington
- Département de Géographie, Université Paris 8 Vincennes-Saint-Denis, UMR7533 Ladyss, Saint-Denis, France
| | - Sthéphanie Vandentorren
- Scientific and International Division, Santé Publique France, the French National Public Health Agency, Saint-Maurice, France
| | - Anne Gallay
- Non-Communicable Diseases and Trauma Division, Santé Publique France, the French National Public Health Agency, 12, rue du Val d'Osne, 94415, Saint-Maurice, France
| | - Nolwenn Regnault
- Non-Communicable Diseases and Trauma Division, Santé Publique France, the French National Public Health Agency, 12, rue du Val d'Osne, 94415, Saint-Maurice, France
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Hanson C, Samson K, Anderson-Berry AL, Slotkowski RA, Su D. Racial disparities in caesarean delivery among nulliparous women that delivered at term: cross-sectional decomposition analysis of Nebraska birth records from 2005-2014. BMC Pregnancy Childbirth 2022; 22:329. [PMID: 35428241 PMCID: PMC9013155 DOI: 10.1186/s12884-022-04666-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 02/28/2022] [Indexed: 11/21/2022] Open
Abstract
Background Previous studies suggest higher rates of caesarean section among women who identify as racial/ethnic minorities. The objective of this study was to understand factors contributing to differences in caesarean rates across racial and ethnic groups. Methods Data was collected from 2005 to 2014 Nebraska birth records on nulliparous, singleton births occurring on or after 37 weeks gestation (n = 87,908). Risk ratios (RR) and 95% confidence intervals (CI) for caesarean were calculated for different racial and ethnic categories, adjusting for maternal age, marital status, county of residence, education, insurance status, pre-pregnancy BMI, and smoking status. Fairlie decomposition technique was utilized to quantify the contribution of individual variables to the observed differences in caesarean. Results In the adjusted analysis, relative to non-Hispanic (NH) White race, both Asian-NH (RR 1.21, 95% CI 1.14, 1.28) and Black-NH races (RR 1.13, 95% CI 1.08, 1.19) were associated with a significantly higher risk for caesarean. The decomposition analysis showed that among the variables assessed, maternal age, education, and pre-pregnancy BMI contributed the most to the observed differences in caesarean rates across racial/ethnic groups. Conclusion This analysis quantified the effect of social and demographic factors on racial differences in caesarean delivery, which may guide public health interventions aimed towards reducing racial disparities in caesarean rates. Interventions targeted towards modifying maternal characteristics, such as reducing pre-pregnancy BMI or increasing maternal education, may narrow the gap in caesarean rates across racial and ethnic groups. Future studies should determine the contribution of physician characteristics, hospital characteristics, and structural determinants of health towards racial disparities in caesarean rates.
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Trønnes JN, Lupattelli A, Handal M, Skurtveit S, Ystrom E, Nordeng H. Association of Timing and Duration of Prenatal Analgesic Opioid Exposure With Attention-Deficit/Hyperactivity Disorder in Children. JAMA Netw Open 2021; 4:e2124324. [PMID: 34524436 PMCID: PMC8444023 DOI: 10.1001/jamanetworkopen.2021.24324] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
IMPORTANCE Prior studies have reported that the use of illicit opioids during pregnancy is associated with increased risk of attention-deficit/hyperactivity disorder (ADHD) in offspring; however, evidence regarding the association of analgesic opioids is limited. OBJECTIVE To examine the association of timing and duration of prenatal analgesic opioid exposure with ADHD in children. DESIGN, SETTING, AND PARTICIPANTS This cohort study uses data from the Norwegian Mother, Father and Child Cohort study (1999-2008), a nationwide birth cohort study linked to national health registries, with a mean (SD) follow-up of 10.8 (2.2) years. A total of 73 784 live-born singleton children born to 62 013 mothers who reported a pain-related condition before and/or during pregnancy were included, with 2 comparator groups: (1) mothers who did not use any opioids and (2) mothers who used opioids before pregnancy only. Data were analyzed from June to December 2020. EXPOSURES Maternal self-report of analgesic opioid use during pregnancy, by timing (early and middle and/or late) and duration (≥5 weeks vs ≤4 weeks). MAIN OUTCOMES AND MEASURES Diagnosis of ADHD or filled prescription for ADHD medication in children and symptoms of ADHD at child age 5 years, measured by Conners' Parent Rating Scale-Revised. Inverse probability of treatment weights were used to control for measured confounding. Cox regression was used to estimate hazard ratios (HRs) and 95% CIs. RESULTS The analyses of ADHD diagnosis and ADHD symptoms included 73 480 children (35 996 [49.0%] girls; mean [SD] maternal age, 30.0 [4.6] years) and 31 270 children (15 377 [49.2%] girls; mean [SD] maternal age, 30.5 [4.4] years), respectively. Overall, 1726 children in the ADHD diagnosis sample (2.3%) and 667 children in the ADHD symptom sample (2.1%) were exposed to an analgesic opioid at least once during gestation. No associations between timing of prenatal analgesic opioid exposure and ADHD diagnosis or symptoms was found. Exposure for 5 or more weeks was associated with an increased risk of ADHD diagnosis (HR, 1.60, 95% CI, 1.04-2.47) compared with exposure for 4 weeks or less; however, there was no such association for the risk of ADHD symptoms. CONCLUSIONS AND RELEVANCE In this cohort study, a slightly elevated risk of ADHD diagnosis after prenatal analgesic opioid exposure for 5 or more weeks was found compared with exposure for 4 weeks or less. This result may be driven by longer duration of use; however, the role of residual or unmeasured confounding cannot be excluded. This finding needs to be replicated in other studies.
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Affiliation(s)
- Johanne Naper Trønnes
- PharmacoEpidemiology and Drug Safety Research Group, Department of Pharmacy, PharmaTox Strategic Research Initiative, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
| | - Angela Lupattelli
- PharmacoEpidemiology and Drug Safety Research Group, Department of Pharmacy, PharmaTox Strategic Research Initiative, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
| | - Marte Handal
- Department of Mental Disorders, Norwegian Institute of Public Health, Oslo, Norway
| | - Svetlana Skurtveit
- Department of Mental Disorders, Norwegian Institute of Public Health, Oslo, Norway
| | - Eivind Ystrom
- PharmacoEpidemiology and Drug Safety Research Group, Department of Pharmacy, PharmaTox Strategic Research Initiative, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
- Department of Mental Disorders, Norwegian Institute of Public Health, Oslo, Norway
- PROMENTA Research Center, Department of Psychology, University of Oslo, Oslo, Norway
| | - Hedvig Nordeng
- PharmacoEpidemiology and Drug Safety Research Group, Department of Pharmacy, PharmaTox Strategic Research Initiative, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
- Department of Child Health and Development, Norwegian Institute of Public Health, Oslo, Norway
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Dunne J, Tessema GA, Ognjenovic M, Pereira G. Quantifying the influence of bias in reproductive and perinatal epidemiology through simulation. Ann Epidemiol 2021; 63:86-101. [PMID: 34384883 DOI: 10.1016/j.annepidem.2021.07.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 07/20/2021] [Accepted: 07/31/2021] [Indexed: 11/25/2022]
Abstract
PURPOSE The application of simulated data in epidemiological studies enables the illustration and quantification of the magnitude of various types of bias commonly found in observational studies. This was a review of the application of simulation methods to the quantification of bias in reproductive and perinatal epidemiology and an assessment of value gained. METHODS A search of published studies available in English was conducted in August 2020 using PubMed, Medline, Embase, CINAHL, and Scopus. A gray literature search of Google and Google Scholar, and a hand search using the reference lists of included studies was undertaken. RESULTS Thirty-nine papers were included in this study, covering information (n = 14), selection (n = 14), confounding (n = 9), protection (n = 1), and attenuation bias (n = 1). The methods of simulating data and reporting of results varied, with more recent studies including causal diagrams. Few studies included code for replication. CONCLUSIONS Although there has been an increasing application of simulation in reproductive and perinatal epidemiology since 2015, overall this remains an underexplored area. Further efforts are required to increase knowledge of how the application of simulation can quantify the influence of bias, including improved design, analysis and reporting. This will improve causal interpretation in reproductive and perinatal studies.
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Affiliation(s)
- Jennifer Dunne
- Curtin School of Population Health, Curtin University, Bentley, WA, Australia.
| | - Gizachew A Tessema
- Curtin School of Population Health, Curtin University, Bentley, WA, Australia; School of Public Health, University of Adelaide, Adelaide, SA, Australia
| | - Milica Ognjenovic
- Curtin School of Population Health, Curtin University, Bentley, WA, Australia
| | - Gavin Pereira
- Curtin School of Population Health, Curtin University, Bentley, WA, Australia; Center for Fertility and Health (CeFH), Norwegian Institute of Public Health, Oslo, Norway
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Elmrayed S, Metcalfe A, Brenner D, Wollny K, Fenton TR. Are small-for-gestational-age preterm infants at increased risk of overweight? Statistical pitfalls in overadjusting for body size measures. J Perinatol 2021; 41:1845-1851. [PMID: 33850286 DOI: 10.1038/s41372-021-01050-5] [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] [Received: 11/03/2020] [Revised: 02/04/2021] [Accepted: 03/29/2021] [Indexed: 01/31/2023]
Abstract
OBJECTIVE The objective of this study is to analyze the effect of adjusting for body measures on the association between small for gestational age (SGA) and overweight at 3 years. STUDY DESIGN Data were obtained from the Preterm Infant Multicenter Growth Study (n = 1089). Logistic regression was used, to adjust for confounders with additional adjustments separately for weight and height at 21 months. Marginal structural models (MSMs) estimated the direct effect of SGA on overweight. RESULTS The crude and adjusted for confounders models yielded null associations between SGA and overweight. Adjusting for height yielded a positive association (odds ratio (OR): 2.31, 95% CI: 0.52-10.26) and adjusting for weight provided a significantly positive association (OR: 6.60, 95% CI: 1.10-37.14). The MSMs, with height and weight held constant, provided no evidence for a direct effect of SGA on overweight (OR: 0.83, 95% CI: 0.14-5.01, OR: 0.71, 95% CI: 0.18-2.81, respectively). CONCLUSION Adjusting for body measures can change the association between SGA and overweight, providing spurious estimates.
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Affiliation(s)
- Seham Elmrayed
- Department of Community Health Sciences, O'Brien Institute of Public Health, Alberta Children's Hospital Research Institute, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
| | - Amy Metcalfe
- Department of Community Health Sciences, O'Brien Institute of Public Health, Alberta Children's Hospital Research Institute, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Darren Brenner
- Department of Community Health Sciences, O'Brien Institute of Public Health, Alberta Children's Hospital Research Institute, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Krista Wollny
- Department of Community Health Sciences, O'Brien Institute of Public Health, Alberta Children's Hospital Research Institute, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Tanis R Fenton
- Department of Community Health Sciences, O'Brien Institute of Public Health, Alberta Children's Hospital Research Institute, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.,Nutrition Services, Alberta Health Services, Calgary, AB, Canada
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Mulla ZD, Pathak IS. Sleep Apnea and Poor COVID-19 Outcomes: Beware of Causal Intermediates and Colliders. Am J Respir Crit Care Med 2021; 203:1325-1326. [PMID: 33684329 PMCID: PMC8456470 DOI: 10.1164/rccm.202101-0088le] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Zuber D Mulla
- Texas Tech University Health Sciences Center El Paso, El Paso, Texas, and.,Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Indu S Pathak
- Texas Tech University Health Sciences Center El Paso, El Paso, Texas, and.,El Paso Children's Hospital, El Paso, Texas
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11
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Original article: is the protective association between hyperemesis gravidarum and birth defects biased by pregnancy termination? Ann Epidemiol 2021; 59:10-15. [PMID: 33798708 DOI: 10.1016/j.annepidem.2021.03.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 03/17/2021] [Accepted: 03/17/2021] [Indexed: 01/17/2023]
Abstract
PURPOSE We assessed whether the protective association between hyperemesis gravidarum and birth defects could be due to selection bias from exclusion of pregnancy terminations. METHODS We designed a cohort study of 2,115,581 live births in Canada, 1990-2016. The main exposure measure was hyperemesis gravidarum. The main outcome measure included any birth defect at delivery. We estimated risk ratios (RR) and 95% confidence intervals (CI) for the association of hyperemesis gravidarum with birth defects in log-binomial regression models, and assessed the extent of selection bias through correction factors. RESULTS Hyperemesis gravidarum was associated with 0.88 times the risk of birth defects in models not corrected for bias (95% CI 0.82-0.94). Correction for selection bias suggested that if screening for birth defects was associated with 1.33 times the chance of detecting birth defects and having a pregnancy termination, there would be no association with hyperemesis gravidarum. If ultrasound was associated with 2.00 times the chance of detecting birth defects and 1.50 times the risk of pregnancy termination, hyperemesis gravidarum would be associated with 1.27 times the risk of birth defects (95% CI 1.18-1.35). CONCLUSIONS The protective association between hyperemesis gravidarum and birth defects in previous studies may be due to selection bias.
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Cragg JJ, Azoulay L, Collins G, De Vera MA, Etminan M, Lalji F, Gershon AS, Guyatt G, Harrison M, Jutzeler C, Kassam R, Kendzerska T, Lynd L, Mansournia MA, Sadatsafavi M, Tong B, Warner FM, Tremlett H. The reporting of observational studies of drug effectiveness and safety: recommendations to extend existing guidelines. Expert Opin Drug Saf 2021; 20:1-8. [PMID: 33170749 DOI: 10.1080/14740338.2021.1849134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 11/06/2020] [Indexed: 12/17/2022]
Abstract
INTRODUCTION The use of observational data to assess drug effectiveness and safety can provide relevant information, much of which may not be feasible to obtain through randomized clinical trials. Because observational studies provide critical drug safety and effectiveness information that influences drug policy and prescribing practices, transparent, consistent, and accurate reporting of these studies is critical. AREAS COVERED We provide recommendations to extend existing reporting guidelines, covering the main components of primary research studies (methods, results, discussion). EXPERT OPINION Our recommendations include extending drug safety and effectiveness guidelines to include explicit checklist items on: study registration, causal diagrams, rationale for measures of effect, comprehensive assessment of bias, comprehensive data cleaning steps, drug equivalents, subject-level drug data visualization, sex and gender-based analyses and results, patient-oriented outcomes, and patient involvement in research.
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Affiliation(s)
- Jacquelyn J Cragg
- Faculty of Pharmaceutical Sciences, University of British Columbia , Vancouver, BC, Canada
- International Collaboration on Repair Discoveries (ICORD), University of British Columbia , Vancouver, BC, Canada
| | - Laurent Azoulay
- Department of Epidemiology, Biostatistics, and Occupational Health, McGill University , Montreal, QC, Canada
| | - Gary Collins
- Centre for Statistics in Medicine, University of Oxford , Oxford, United Kingdom & EQUATOR
| | - Mary A De Vera
- Faculty of Pharmaceutical Sciences, University of British Columbia , Vancouver, BC, Canada
| | - Mahyar Etminan
- Departments of Ophthalmology and Medicine, Faculty of Medicine, University of British Columbia , Vancouver, BC, Canada
| | - Fawziah Lalji
- Faculty of Pharmaceutical Sciences, University of British Columbia , Vancouver, BC, Canada
| | - Andrea S Gershon
- Department of Medicine, University of Toronto , Toronto, Ontario
| | - Gordon Guyatt
- Department of Health Research Methods, Evidence & Impact, McMaster University , Hamilton, Ontario, Canada
| | - Mark Harrison
- Faculty of Pharmaceutical Sciences, University of British Columbia , Vancouver, BC, Canada
- Center for Health Evaluation and Outcome Sciences (CHEOS), St. Paul's Hospital , Vancouver, BC, Canada
| | - Catherine Jutzeler
- Department of Biosystems Science & Engineering, ETH Zurich , Zurich, Switzerland
| | - Rosemin Kassam
- School of Population and Public Health, University of British Columbia , Vancouver, BC, Canada
| | | | - Larry Lynd
- Faculty of Pharmaceutical Sciences, University of British Columbia , Vancouver, BC, Canada
| | - Mohammad Ali Mansournia
- Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences , Tehran, Iran
| | - Mohsen Sadatsafavi
- Faculty of Pharmaceutical Sciences, University of British Columbia , Vancouver, BC, Canada
| | - Bobo Tong
- International Collaboration on Repair Discoveries (ICORD), University of British Columbia , Vancouver, BC, Canada
| | - Freda M Warner
- Faculty of Pharmaceutical Sciences, University of British Columbia , Vancouver, BC, Canada
| | - Helen Tremlett
- Division of Neurology, Department of Medicine, University of British Columbia , Vancouver, BC, Canada
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Nawa N, Garrison-Desany HM, Kim Y, Ji Y, Hong X, Wang G, Pearson C, Zuckerman BS, Wang X, Surkan PJ. Maternal persistent marijuana use and cigarette smoking are independently associated with shorter gestational age. Paediatr Perinat Epidemiol 2020; 34:696-705. [PMID: 32602574 PMCID: PMC7581539 DOI: 10.1111/ppe.12686] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 04/05/2020] [Accepted: 04/12/2020] [Indexed: 01/21/2023]
Abstract
BACKGROUND Research assessing the effects of marijuana use on preterm birth has found mixed results, in part, due to lack of attention to the role of maternal tobacco smoking during pregnancy. OBJECTIVES The study objective was to investigate whether maternal marijuana use was independently associated with gestational age, preterm birth, and two preterm birth subtypes (spontaneous vs clinician-initiated). METHODS Participants included 8261 mother-newborn pairs from the Boston Birth Cohort. Information on gestational age was collected from electronic medical records. Marijuana use and tobacco smoking during pregnancy were assessed through a standard questionnaire after birth. Linear and log-linear regression models were used to assess associations between marijuana use with and without tobacco smoking during pregnancy and the outcomes of interest. RESULTS Of the 8261 mothers, 27.5% had preterm births. About 3.5% of mothers with term deliveries and 5.2% of mothers with preterm births used marijuana during pregnancy. Marijuana use and cigarette smoking were independently associated with a decrease in gestational age by 0.50 weeks (95% confidence interval [CI] -0.87, -0.13) and 0.52 weeks (95% CI -0.76, -0.28), respectively. Marijuana use during early or late pregnancy was associated with a similar decrease in gestational age by 0.50 weeks. When we examined the effects on the preterm birth subtypes, simultaneous marijuana use and tobacco smoking were associated with higher risk of spontaneous preterm birth (RR 1.64, 95% CI 1.23, 2.18). The elevated risk was not observed with clinician-initiated preterm birth. CONCLUSIONS In this high-risk US population, maternal marijuana use and cigarette smoking during pregnancy were independently associated with shorter gestational age. When we examined the effects on preterm birth subtypes, the elevated risk was only observed with spontaneous preterm birth.
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Affiliation(s)
- Nobutoshi Nawa
- Center on Early Life Origins of Disease, Department of Population, Family and Reproductive Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
- Department of Global Health Promotion, Tokyo Medical and Dental University, Tokyo, Japan
- Department of Medical Education Research and Development, Tokyo Medical and Dental University, Tokyo, Japan
| | - Henri M. Garrison-Desany
- Center on Early Life Origins of Disease, Department of Population, Family and Reproductive Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
- Department of International Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Yoona Kim
- Center on Early Life Origins of Disease, Department of Population, Family and Reproductive Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
- Department of International Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Yuelong Ji
- Center on Early Life Origins of Disease, Department of Population, Family and Reproductive Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Xiumei Hong
- Center on Early Life Origins of Disease, Department of Population, Family and Reproductive Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Guoying Wang
- Center on Early Life Origins of Disease, Department of Population, Family and Reproductive Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Colleen Pearson
- Department of Pediatrics, Boston University School of Medicine and Boston Medical Center, Boston, Massachusetts, USA
| | - Barry S. Zuckerman
- Department of Pediatrics, Boston University School of Medicine and Boston Medical Center, Boston, Massachusetts, USA
| | - Xiaobin Wang
- Center on Early Life Origins of Disease, Department of Population, Family and Reproductive Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
- Division of General Pediatrics & Adolescent Medicine, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Pamela J. Surkan
- Department of International Health, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
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Examining the trimester-specific effects of low gestational weight gain on birthweight: the BOSHI study. J Dev Orig Health Dis 2020; 12:280-285. [PMID: 32319361 DOI: 10.1017/s2040174420000240] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Low gestational weight gain (GWG) is a known risk factor of low birthweight. Although studies have previously examined the associations between GWG and birthweight, the period-specific effects of low GWG in each trimester remain unclear. This study aimed to quantify the trimester-specific direct effects of low GWG in Japanese women on birthweight. Using perinatal data from a cohort study, we analyzed pregnant women delivered at an obstetrics/gynecology hospital between October 2006 and May 2010. We focused on women with a pre-pregnancy body mass index (BMI) below 25 kg/m2. The exposure was low GWG. The gestation period was subdivided into trimesters, and the direct effects of low trimester-specific GWG on birthweight were estimated using marginal structural models. These models were guided by a direct acyclic graph that incorporated potential confounders, including pre-pregnancy BMI, age, smoking during pregnancy, height, and parity. We analyzed 563 women and their families. The mean cumulative GWG by the end of the first, second, and third trimesters was 0.9, 6.2, and 10.7 kg, respectively. Approximately 14.0% of the women gained total weight below the range recommended by Japanese Ministry of Health, Labour and Welfare. The direct effects of low GWG on birthweight were 65.9 g (95% confidence interval: 11.4, 120.5), -195.4 g (-263.4, -127.4), and -188.8 g (-292.0, -85.5) for the first, second, and third trimesters, respectively. Insufficient weight gain in the second and third trimesters had a negative impact on birthweight after adjusting for pre-pregnancy BMI and other covariates.
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Rasmussen-Torvik LJ, Zumpf KB, Betcher HK, Ciolino JD. Interpreting the pharmacoepidemiology literature in obstetrical studies: A guide for clinicians. Semin Perinatol 2020; 44:151225. [PMID: 32247516 PMCID: PMC7214119 DOI: 10.1016/j.semperi.2020.151225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Many prescribers are knowledgeable about randomized controlled trials (RCT), but are less familiar with pharmacoepidemiology studies; that is, observational studies in which a pharmacologic agent is the exposure of interest. To date, few clinical trials include pregnant women. With the absence of RCT data, prescribers must largely rely on the pharmacoepidemiology literature to guide prescribing decisions for pregnant patients. We describe different types of pharmacoepidemiology studies and present a flowchart and table checklist to support clinicians to assess the quality of, and thus the validity of conclusions from, pharmacoepidemiology studies. We provide illustrative examples of published observational studies examining antidepressant treatment during pregnancy and fetal and infant outcomes.
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Affiliation(s)
- Laura J. Rasmussen-Torvik
- Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Katelyn B Zumpf
- Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Hannah K. Betcher
- Department of Psychiatry, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Jody D. Ciolino
- Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
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Wang Z, Ho PWH, Choy MTH, Wong ICK, Brauer R, Man KKC. Advances in Epidemiological Methods and Utilisation of Large Databases: A Methodological Review of Observational Studies on Central Nervous System Drug Use in Pregnancy and Central Nervous System Outcomes in Children. Drug Saf 2020; 42:499-513. [PMID: 30421346 DOI: 10.1007/s40264-018-0755-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
INTRODUCTION Studies have used various epidemiological approaches to study associations between central nervous system (CNS) drug use in pregnancy and CNS outcomes in children. Studies have generally focused on clinical adverse effects, whereas variations in methodologies have not received sufficient attention. OBJECTIVE Our objective was to review the methodological characteristics of existing studies to identify any limitations and recommend further research. METHODS A systematic literature search was conducted on observational studies listed in PubMed from 1 January 1946 to 21 September 2017. Following independent screening and data extraction, we conducted a review addressing the trends of relevant studies, differences between various data sources, and methods used to address bias and confounders; we also conducted statistical analyses. RESULTS In total, 111 observational studies, 25 case-control studies, and 86 cohort studies were included in the review. Publications dating from 1978 to 2006 mainly focused on antiepileptic drugs, but research on antidepressants increased from 2007 onwards. Only one study focused on antipsychotic use during pregnancy. A total of 46 studies obtained data from an administrative database/registry, 20 from ad hoc disease registries, and 41 from ad hoc clinical samples. Most studies (58%) adjusted the confounding factors using general adjustment, whereas only a few studies used advanced methods such as sibling-matched models and propensity score methods; 42 articles used univariate analyses and 69 conducted multivariable regression analyses. CONCLUSION Multiple factors, including different study designs and data sources, have led to inconsistent findings in associations between CNS drug use in pregnancy and CNS outcomes in children. Researchers should allow for study designs with clearly defined exposure periods, at the very least in trimesters, and use advanced confounding adjustment methodology to increase the accuracy of the findings.
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Affiliation(s)
- Zixuan Wang
- Research Department of Practice and Policy, UCL School of Pharmacy, Mezzanine Floor, BMA House, Entrance A, Tavistock Square, London, WC1H 9JP, UK
| | - Phoebe W H Ho
- Centre for Safe Medication Practice and Research, Department of Pharmacology and Pharmacy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong
| | - Michael T H Choy
- Centre for Safe Medication Practice and Research, Department of Pharmacology and Pharmacy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong
| | - Ian C K Wong
- Research Department of Practice and Policy, UCL School of Pharmacy, Mezzanine Floor, BMA House, Entrance A, Tavistock Square, London, WC1H 9JP, UK.,Centre for Safe Medication Practice and Research, Department of Pharmacology and Pharmacy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong
| | - Ruth Brauer
- Research Department of Practice and Policy, UCL School of Pharmacy, Mezzanine Floor, BMA House, Entrance A, Tavistock Square, London, WC1H 9JP, UK
| | - Kenneth K C Man
- Research Department of Practice and Policy, UCL School of Pharmacy, Mezzanine Floor, BMA House, Entrance A, Tavistock Square, London, WC1H 9JP, UK. .,Centre for Safe Medication Practice and Research, Department of Pharmacology and Pharmacy, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pok Fu Lam, Hong Kong. .,Department of Medical Informatics, Erasmus University Medical Center, Rotterdam, The Netherlands.
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17
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Kloster S, Tolstrup JS, Olsen MS, Johnsen SP, Søndergaard L, Nielsen DG, Ersbøll AK. Neonatal Risk in Children of Women With Congenital Heart Disease: A Cohort Study With Focus on Socioeconomic Status. J Am Heart Assoc 2019; 8:e013491. [PMID: 31656122 PMCID: PMC6898817 DOI: 10.1161/jaha.119.013491] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Background We hypothesized that women with congenital heart disease (CHD) are at increased risk of giving birth preterm, including very and moderately preterm and giving birth to infants small for gestational age (SGA). We aimed to investigate this in a nation‐wide study with focus on the potential modifying effect of socioeconomic status. Methods and Results We performed a cohort study using Danish nation‐wide registers between 1997 and 2014. The exposure, maternal CHD, was subdivided into simple, moderate and complex based on severity of defects. Outcomes were preterm birth and SGA. Cox regression was used to estimate hazard ratios (HR). A total of 933 149 births including 3745 births among women with CHD were studied. The risk of giving birth preterm and SGA were higher among women with CHD as compared with women without CHD; for example, adjusted hazard ratios of preterm birth according to severity: simple 1.33 (95% CI, 1.11–1.59), moderate 1.45 (95% CI, 1.14–1.83) and complex 3.26 (95% CI, 2.41–4.40). Same pattern was seen for very and moderately preterm births and SGA. Education was a strong predictor of both preterm birth and SGA but did not modify the association between maternal congenital heart disease and preterm birth (P=0.38) or SGA (P=0.99). Conclusions Women with CHD were at increased risk of preterm birth both, moderately and very preterm, as well as giving birth to infants SGA. Education was a strong predictor of both preterm birth and SGA but the association between CHD and risk of preterm birth and SGA was independent of educational level.
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Affiliation(s)
- Stine Kloster
- The National Institute of Public Health University of Southern Denmark Copenhagen Denmark
| | - Janne S Tolstrup
- The National Institute of Public Health University of Southern Denmark Copenhagen Denmark
| | | | | | - Lars Søndergaard
- Department of Cardiology Rigshospitalet Copenhagen Denmark.,University Hospital of Copenhagen Copenhagen Denmark
| | - Dorte Guldbrand Nielsen
- Department of Clinical Medicine Aarhus University Aarhus Denmark.,Department of Cardiology Aarhus University Hospital Aarhus Denmark
| | - Annette Kjær Ersbøll
- The National Institute of Public Health University of Southern Denmark Copenhagen Denmark
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18
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Cai Q, Liu H, Han W, Liu L, Xu Y, He Y, Li Q, Zhang M, Hu A, Zheng Y. Maternal HBsAg carriers and adverse pregnancy outcomes: A hospital-based prospective cohort analysis. J Viral Hepat 2019; 26:1011-1018. [PMID: 30972911 DOI: 10.1111/jvh.13105] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 02/15/2019] [Accepted: 03/14/2019] [Indexed: 12/19/2022]
Abstract
It is not clear whether chronic hepatitis B virus (HBV) infection during pregnancy can increase the risk of adverse pregnancy outcomes for both mothers and neonates. We conducted a hospital-based prospective cohort study on pregnant women (PW) and used an analysis strategy that was guided by directed acyclic graphs (DAGs). Maternal characteristics and major adverse pregnancy outcomes were collected both from questionnaires and hospital-based electronic medical records. Serum hepatitis B surface antigen (HBsAg) and hepatitis B e antigen (HBeAg) status were determined. In total, 3329 of the 3416 pregnant women who received routine antenatal care in a hospital setting at baseline, including 346 HBsAg carriers, were available for analysis. Maternal HBsAg carrier status was associated with an increased risk of intrahepatic cholestasis pregnancy [aOR (adjusting odds ratio) = 1.70; 95% CI (confidence interval) = 1.16-2.49], premature rupture of the membranes (aOR = 1.38; 95% CI = 1.00-1.89) and large for gestational age birth aOR = 1.67; 95% CI = 1.17-2.39). The risk of intrahepatic cholestasis remained in pregnant women with either HBeAg-positive (aOR = 2.96; 95% CI = 1.33-6.62) or HBeAg-negative (aOR = 1.52; 95% CI =1.00-2.32)] status; notably, only maternal HBeAg-negative status was associated with a higher risk of large for gestational age birth (aOR = 1.91; 95% CI = 1.33-2.76). Our results implied that chronic HBV infection during pregnancy may increase the risk of intrahepatic cholestasis of pregnancy, premature rupture of membranes and large for gestational age pregnancies.
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Affiliation(s)
- Qianying Cai
- Key Laboratory for Public Health Safety, Department of Epidemiology, School of Public Health, Fudan University, Shanghai, China
| | - Haiyan Liu
- Department of Clinical Laboratory, Anqing Municipal Hospital, Anqing, China
| | - Wenhui Han
- Department of Obstetrics and Gynecology, Anqing Municipal Hospital, Anqing, China
| | - Lili Liu
- Key Laboratory for Public Health Safety, Department of Epidemiology, School of Public Health, Fudan University, Shanghai, China
| | - Yunyun Xu
- Department of Clinical Laboratory, Anqing Municipal Hospital, Anqing, China
| | - Yining He
- Key Laboratory for Public Health Safety, Department of Epidemiology, School of Public Health, Fudan University, Shanghai, China
| | - Qing Li
- Department of Obstetrics and Gynecology, Anqing Municipal Hospital, Anqing, China
| | - Miao Zhang
- Key Laboratory for Public Health Safety, Department of Epidemiology, School of Public Health, Fudan University, Shanghai, China
| | - Anqun Hu
- Department of Clinical Laboratory, Anqing Municipal Hospital, Anqing, China
| | - Yingjie Zheng
- Key Laboratory for Public Health Safety, Department of Epidemiology, School of Public Health, Fudan University, Shanghai, China.,Key Laboratory for Health Technology Assessment, National Commission of Health and Family Planning, Fudan University, Shanghai, China
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Ramakrishnan R, Stuart AL, Salemi JL, Chen H, O'Rourke K, Kirby RS. Maternal exposure to ambient cadmium levels, maternal smoking during pregnancy, and congenital diaphragmatic hernia. Birth Defects Res 2019; 111:1399-1407. [DOI: 10.1002/bdr2.1555] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 07/10/2019] [Accepted: 07/10/2019] [Indexed: 11/06/2022]
Affiliation(s)
- Rema Ramakrishnan
- College of Public HealthUniversity of South Florida Tampa Florida
- Nuffield Department of Women's and Reproductive HealthThe George Institute for Global Health, University of Oxford Oxford UK
- University of New South Wales Sydney New South Wales Australia
| | - Amy L. Stuart
- College of Public HealthUniversity of South Florida Tampa Florida
| | - Jason L. Salemi
- Department of Family and Community MedicineBaylor College of Medicine Houston Texas
| | - Henian Chen
- College of Public HealthUniversity of South Florida Tampa Florida
| | | | - Russell S. Kirby
- College of Public HealthUniversity of South Florida Tampa Florida
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Chawla D, Yang YC, Desrosiers TA, Westreich DJ, Olshan AF, Daniels JL. Past-month cannabis use among U.S. individuals from 2002-2015: An age-period-cohort analysis. Drug Alcohol Depend 2018; 193:177-182. [PMID: 30384326 PMCID: PMC6542262 DOI: 10.1016/j.drugalcdep.2018.05.035] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 05/22/2018] [Accepted: 05/26/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND Cannabis is the most commonly used illicit drug among U.S. adolescents and adults, but little is known about factors that drive trends in cannabis use prevalence. To better understand drivers of these trends, we aimed to estimate age, period, and cohort effects on past-month cannabis use among U.S. individuals age 12 and older from 2002 to 2015. METHODS We conducted an age-period-cohort analysis on past-month cannabis use among participants ages 12 and older using the National Survey on Drug Use and Health (NSDUH), an annual cross-sectional nationally-representative survey of drug use. Additionally, we examined how age, period, and cohort effects differed across gender. Participants (n = 779,799) self-reported cannabis patterns using a computer-assisted telephone interview (CATI). RESULTS Past-month cannabis use in this population increased from 6.0% in 2002 to 8.1% in 2015. Distinct age, period, and cohort effects were observed. Compared to participants ages 12-13, participants ages 18-21 (PR: 16.8, 95% CI: 15.6, 18.1) and 22-25 (PR: 13.2, 95% CI: 12.2, 14.4) had dramatically higher prevalence of past-month cannabis use. Compared to participants in 2002, participants in 2014 (PR: 1.2, 95% CI: 1.1, 1.4) and 2014 (PR: 1.2, 95% CI: 1.1, 1.4) had slightly higher prevalence of past-month cannabis use. Compared to the 1940s birth cohort, the 1950s birth cohort (PR: 1.8, 95% CI: 1.5, 2.2) had a higher prevalence of past-month cannabis use. CONCLUSIONS Past-month cannabis use is prevalent and increasing among U.S. adults. Distinct age, period, and cohort effects are at play, though age effects are strongest.
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Affiliation(s)
- Devika Chawla
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, 2101 McGavran-Greenberg Hall, CB #7435, Chapel Hill, NC 27599, USA.
| | - Yang C Yang
- Department of Sociology, University of North Carolina at Chapel Hill, 155 Hamilton Hall, CB #3210, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, CB #7295, Chapel Hill, NC 27599, USA; Carolina Population Center, University of North Carolina at Chapel Hill, 123 West Franklin St, CB #8120, Chapel Hill, NC 27516, USA
| | - Tania A Desrosiers
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, 2101 McGavran-Greenberg Hall, CB #7435, Chapel Hill, NC 27599, USA
| | - Daniel J Westreich
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, 2101 McGavran-Greenberg Hall, CB #7435, Chapel Hill, NC 27599, USA
| | - Andrew F Olshan
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, 2101 McGavran-Greenberg Hall, CB #7435, Chapel Hill, NC 27599, USA
| | - Julie L Daniels
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, 2101 McGavran-Greenberg Hall, CB #7435, Chapel Hill, NC 27599, USA
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Bandoli G, Palmsten K, Chambers CD, Jelliffe-Pawlowski LL, Baer RJ, Thompson CA. Revisiting the Table 2 fallacy: A motivating example examining preeclampsia and preterm birth. Paediatr Perinat Epidemiol 2018; 32:390-397. [PMID: 29782045 PMCID: PMC6103824 DOI: 10.1111/ppe.12474] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND A "Table Fallacy," as coined by Westreich and Greenland, reports multiple adjusted effect estimates from a single model. This practice, which remains common in published literature, can be problematic when different types of effect estimates are presented together in a single table. The purpose of this paper is to quantitatively illustrate this potential for misinterpretation with an example estimating the effects of preeclampsia on preterm birth. METHODS We analysed a retrospective population-based cohort of 2 963 888 singleton births in California between 2007 and 2012. We performed a modified Poisson regression to calculate the total effect of preeclampsia on the risk of PTB, adjusting for previous preterm birth. pregnancy alcohol abuse, maternal education, and maternal socio-demographic factors (Model 1). In subsequent models, we report the total effects of previous preterm birth, alcohol abuse, and education on the risk of PTB, comparing and contrasting the controlled direct effects, total effects, and confounded effect estimates, resulting from Model 1. RESULTS The effect estimate for previous preterm birth (a controlled direct effect in Model 1) increased 10% when estimated as a total effect. The risk ratio for alcohol abuse, biased due to an uncontrolled confounder in Model 1, was reduced by 23% when adjusted for drug abuse. The risk ratio for maternal education, solely a predictor of the outcome, was essentially unchanged. CONCLUSIONS Reporting multiple effect estimates from a single model may lead to misinterpretation and lack of reproducibility. This example highlights the need for careful consideration of the types of effects estimated in statistical models.
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Affiliation(s)
- Gretchen Bandoli
- Department of Pediatrics, University of California, San Diego, La Jolla, CA
| | | | - Christina D Chambers
- Department of Pediatrics, University of California, San Diego, La Jolla, CA,Department of Family Medicine and Public Health, University of California, San Diego, La Jolla, CA
| | - Laura L Jelliffe-Pawlowski
- Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, CA,California Preterm Birth Initiative, University of California San Francisco School of Medicine, San Francisco CA
| | - Rebecca J Baer
- Department of Pediatrics, University of California, San Diego, La Jolla, CA,Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, CA
| | - Caroline A Thompson
- Graduate School of Public Health, San Diego State University, San Diego, CA,Palo Alto Medical Foundation Research Institute, Sutter Health, Palo Alto, CA
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22
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Harris GME, Wood M, Ystrom E, Nordeng H. Prenatal triptan exposure and neurodevelopmental outcomes in 5-year-old children: Follow-up from the Norwegian Mother and Child Cohort Study. Paediatr Perinat Epidemiol 2018; 32:247-255. [PMID: 29569251 DOI: 10.1111/ppe.12461] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Triptans are commonly used to treat migraine headaches, but data on the long-term safety of these medications during pregnancy are sparse. Triptans have a biologically plausible mechanism for effects on the fetal brain through binding to 5-HT1 -receptors, and previous studies show increased risks of externalising behaviour problems in toddlers exposed to triptans during pregnancy. METHODS We included 3784 children in the Norwegian Mother and Child Cohort Study, whose mothers returned the 5-year-questionnaire and reported a history of migraine or triptan use; 353 (9.3%) mothers reported use of triptans during pregnancy, 1509 (39.9%) reported migraine during pregnancy but no triptan use, and 1922 (50.8%) had migraine prior to pregnancy only. We used linear and log-binomial models with inverse probability weights to examine the association between prenatal triptan exposure and internalising and externalising behaviour, communication, and temperament in 5-year-old children. RESULTS Triptan-exposed children scored higher on the sociability trait than unexposed children of mothers with migraine (β 1.66, 95% confidence interval [0.30, 3.02]). We found no other differences in temperament, or increased risk of behaviour or communication problems. CONCLUSIONS Contrary to results from previous studies in younger children, we found no increased risk of externalising behaviour problems in 5-year-old children exposed to triptans in fetal life. Triptan-exposed children did have slightly more sociable temperaments, but the clinical meaning of this finding is uncertain.
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Affiliation(s)
- Gerd-Marie Eskerud Harris
- Pharmacoepidemiology & Drug Safety Research Group, School of Pharmacy, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
| | - Mollie Wood
- Pharmacoepidemiology & Drug Safety Research Group, School of Pharmacy, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
| | - Eivind Ystrom
- Pharmacoepidemiology & Drug Safety Research Group, School of Pharmacy, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway.,Department of Mental Disorders, Norwegian Institute of Public Health, Oslo, Norway.,Department of Psychology, University of Oslo, Oslo, Norway
| | - Hedvig Nordeng
- Pharmacoepidemiology & Drug Safety Research Group, School of Pharmacy, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway.,Department of Child Health and Development, Norwegian Institute of Public Health, Oslo, Norway
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23
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Lemon LS, Naimi A, Caritis SN, Platt RW, Venkataramanan R, Bodnar LM. The Role of Preterm Birth in the Association Between Opioid Maintenance Therapy and Neonatal Abstinence Syndrome. Paediatr Perinat Epidemiol 2018; 32:213-222. [PMID: 29372750 PMCID: PMC5902412 DOI: 10.1111/ppe.12443] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND Pregnant women treated with methadone as opioid maintenance therapy are more likely than women treated with buprenorphine to deliver preterm. Preterm birth is associated with less risk of neonatal abstinence syndrome (NAS). We sought to assess the role of preterm birth as a mediator of the relationship between in utero exposure to methadone and NAS compared with buprenorphine. METHODS We studied 716 women receiving methadone or buprenorphine and delivering liveborn infants at Magee-Womens Hospital, Pittsburgh, Pennsylvania (2013-15). We implemented inverse probability weighted marginal structural models to isolate the role of preterm birth (<37 weeks' gestation). Weights accounted for confounding by maternal age, race, insurance, parity, delivery year, marital, employment, hepatitis C, and smoking status. RESULTS Approximately 57% of the cohort were treated with methadone. Preterm birth was more common in methadone-exposed pregnancies (25% versus 14%). The incidence of NAS treatment was higher in methadone compared with buprenorphine-exposed infants (65% vs 49%), and term compared with preterm births (64% vs 36%). For every 100 infants liveborn to mothers treated for opioid dependence, there were 13 excess cases of NAS among infants exposed to methadone compared with buprenorphine (adjusted risk difference [RD] 13.3, 95% confidence interval [CI] 5.7, 20.9). Among term births, this increased to 17 excess cases of NAS in methadone- compared with buprenorphine-exposed (RD 16.7, 95% CI 9.3, 24.0). CONCLUSION The further increased risk of NAS associated with methadone use vs buprenorphine in term deliveries emphasises the utility of buprenorphine in clinical settings aimed at decreasing NAS.
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Affiliation(s)
- Lara S. Lemon
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh
- Department of Pharmaceutical Science, School of Pharmacy, University of Pittsburgh, Pittsburgh
| | - Ashley Naimi
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh
| | - Steve N. Caritis
- Department of Obstetrics, Gynecology, and Reproductive Sciences, School of Medicine, University of Pittsburgh, Pittsburgh
| | - Robert W. Platt
- Departments of Pediatrics and Epidemiology, Biostatistics and Occupation Health, McGill University, Montreal, Canada
| | - Raman Venkataramanan
- Department of Pharmaceutical Science, School of Pharmacy, University of Pittsburgh, Pittsburgh
- Department of Pathology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Lisa M. Bodnar
- Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh
- Department of Obstetrics, Gynecology, and Reproductive Sciences, School of Medicine, University of Pittsburgh, Pittsburgh
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24
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Prady SL, Hanlon I, Fraser LK, Mikocka-Walus A. A systematic review of maternal antidepressant use in pregnancy and short- and long-term offspring's outcomes. Arch Womens Ment Health 2018; 21:127-140. [PMID: 29027013 PMCID: PMC5856864 DOI: 10.1007/s00737-017-0780-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 09/18/2017] [Indexed: 12/14/2022]
Abstract
The relative safety of antidepressants during pregnancy has received substantial attention, but most syntheses fail to account for mental illness effects. We aimed to evaluate the literature comparing low birth weight (LBW) and neurodevelopmental and neurobehavioural outcomes for children whose mothers took antidepressants in pregnancy compared to those whose mothers had common mental disorders, or symptoms, but who did not take antidepressants during pregnancy. A systematic review was conducted searching PubMed, MEDLINE, PsycINFO and Embase in January 2015. A modified version of the Newcastle Ottawa Scale was used to assess study quality. Eleven cohort studies were included: four reporting a LBW outcome (all with higher risk of bias) and seven reporting a neurodevelopmental outcome (five with higher risk of bias). We found only limited evidence of gestational age-adjusted LBW in exposed children in two studies which had a higher risk of bias and did not control for depressive symptom severity. Only five (7.5%) neurodevelopmental outcomes and one (12.5%) neurobehavioural outcome showed evidence of a statistically significant effect, three out of four were from studies with a higher risk of bias. There is little robust evidence indicating a detrimental effect of antidepressant use during pregnancy on LBW and neurodevelopmental and neurobehavioural outcomes. More rigorous study designs are needed.
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Affiliation(s)
- Stephanie L. Prady
- 0000 0004 1936 9668grid.5685.eDepartment of Health Sciences, University of York, Seebohm Rowntree Building, York, YO10 5DD UK
| | - Inna Hanlon
- 0000 0004 1936 9668grid.5685.eDepartment of Health Sciences, University of York, Seebohm Rowntree Building, York, YO10 5DD UK
| | - Lorna K. Fraser
- 0000 0004 1936 9668grid.5685.eDepartment of Health Sciences, University of York, Seebohm Rowntree Building, York, YO10 5DD UK
| | - Antonina Mikocka-Walus
- 0000 0004 1936 9668grid.5685.eDepartment of Health Sciences, University of York, Seebohm Rowntree Building, York, YO10 5DD UK ,0000 0001 0526 7079grid.1021.2School of Psychology, Deakin University, Burwood, VIC Australia
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25
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Wood ME, Lapane KL, van Gelder MM, Rai D, Nordeng HM. Making fair comparisons in pregnancy medication safety studies: An overview of advanced methods for confounding control. Pharmacoepidemiol Drug Saf 2017; 27:140-147. [PMID: 29044735 PMCID: PMC6646901 DOI: 10.1002/pds.4336] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 08/29/2017] [Accepted: 09/18/2017] [Indexed: 12/12/2022]
Abstract
Understanding the safety of medication use during pregnancy relies on observational studies: However, confounding in observational studies poses a threat to the validity of estimates obtained from observational data. Newer methods, such as marginal structural models and propensity calibration, have emerged to deal with complex confounding problems, but these methods have seen limited uptake in the pregnancy medication literature. In this article, we provide an overview of newer advanced methods for confounding control and show how these methods are relevant for pregnancy medication safety studies.
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Affiliation(s)
- Mollie E. Wood
- PharmacoEpidemiology and Drug Safety Research Group, School of PharmacyUniversity of OsloNorway
| | - Kate L. Lapane
- Department of Quantitative Health SciencesUniversity of Massachusetts Medical SchoolWorcesterMAUSA
| | - Marleen M.H.J. van Gelder
- Department for Health Evidence, Radboud Institute for Health SciencesRadboud University Medical CenterNijmegenThe Netherlands
- Radboud REshape Innovation CenterRadboud University Medical CenterNijmegenThe Netherlands
| | - Dheeraj Rai
- School of Social and Community MedicineUniversity of BristolUK
| | - Hedvig M.E. Nordeng
- PharmacoEpidemiology and Drug Safety Research Group, School of PharmacyUniversity of OsloNorway
- Department of Child Mental and Physical HealthNorwegian Institute of Public HealthOsloNorway
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26
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Ananth CV, Schisterman EF. Confounding, causality, and confusion: the role of intermediate variables in interpreting observational studies in obstetrics. Am J Obstet Gynecol 2017; 217:167-175. [PMID: 28427805 DOI: 10.1016/j.ajog.2017.04.016] [Citation(s) in RCA: 207] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 03/29/2017] [Accepted: 04/05/2017] [Indexed: 11/26/2022]
Abstract
Prospective and retrospective cohorts and case-control studies are some of the most important study designs in epidemiology because, under certain assumptions, they can mimic a randomized trial when done well. These assumptions include, but are not limited to, properly accounting for 2 important sources of bias: confounding and selection bias. While not adjusting the causal association for an intermediate variable will yield an unbiased estimate of the exposure-outcome's total causal effect, it is often that obstetricians will want to adjust for an intermediate variable to assess if the intermediate is the underlying driver of the association. Such a practice must be weighed in light of the underlying research question and whether such an adjustment is necessary should be carefully considered. Gestational age is, by far, the most commonly encountered variable in obstetrics that is often mislabeled as a confounder when, in fact, it may be an intermediate. If, indeed, gestational age is an intermediate but if mistakenly labeled as a confounding variable and consequently adjusted in an analysis, the conclusions can be unexpected. The implications of this overadjustment of an intermediate as though it were a confounder can render an otherwise persuasive study downright meaningless. This commentary provides an exposition of confounding bias, collider stratification, and selection biases, with applications in obstetrics and perinatal epidemiology.
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27
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Histologic Chorioamnionitis and Bronchopulmonary Dysplasia in Preterm Infants: The Epidemiologic Study on Low Gestational Ages 2 Cohort. J Pediatr 2017; 187:98-104.e3. [PMID: 28583707 DOI: 10.1016/j.jpeds.2017.05.019] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 04/12/2017] [Accepted: 05/05/2017] [Indexed: 12/31/2022]
Abstract
OBJECTIVE To investigate the association between histologic chorioamnionitis (HCA) and bronchopulmonary dysplasia (BPD) in very preterm infants, both in a general population and for those born after spontaneous preterm labor and after preterm premature rupture of membranes (pPROM). STUDY DESIGN This study included 2513 live born singletons delivered at 24-31 weeks of gestation from a national prospective population-based cohort of preterm births; 1731 placenta reports were available. HCA was defined as neutrophil infiltrates in the amnion, chorion of the membranes, or chorionic plate, associated or not with funisitis. The main outcome measure was moderate or severe BPD. Analyses involved logistic regressions and multiple imputation for missing data. RESULTS The incidence of HCA was 28.4% overall: 38% in cases of preterm labor, 64% in cases of pPROM, and less than 5% in cases of vascular disorders. Overall, the risk of BPD after adjustment for gestational age, sex, and antenatal steroids was reduced for infants with HCA (HCA alone: aOR 0.6 [95% CI 0.4-0.9]; associated with funisitis: aOR 0.5 [95% CI 0.3-0.8]). This finding was explained by the high rate of BPD and low rate of chorioamnionitis among children with fetal growth restriction. HCA was not associated with BPD in the preterm labor (13.4% vs 8.5%; aOR 0.9; 95% CI 0.5-1.8) or in the pPROM group (12.9% vs 12.1%; aOR 0.6; 95% CI 0.3-1.3). CONCLUSION In homogeneous groups of infants born after preterm labor or pPROM, HCA is not associated with BPD.
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28
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Getz KD. Response to Letter Re: Maternal Pre-Pregnancy Body Mass Index and Autism Spectrum Disorder in the Offspring. Paediatr Perinat Epidemiol 2017; 31:166. [PMID: 28231396 DOI: 10.1111/ppe.12345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kelly D Getz
- Division of Oncology, The Children's Hospital of Philadelphia, Philadelphia, PA
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