Hebah Kutbi1, George L Wehby2, Lina M Moreno Uribe3, Paul A Romitti4, Suzan Carmichael5, Gary M Shaw5, Andrew F Olshan6, Lisa DeRoo7,8, Sonja A Rasmussen9, Jeffrey C Murray10, Allen Wilcox7, Rolv T Lie8, Ronald G Munger1. 1. Department of Nutrition, Dietetics, and Food Sciences, Utah State University, Logan, UT, USA. 2. Department of Health Management and Policy. 3. Department of Orthodontics. 4. Department of Epidemiology, University of Iowa, Iowa City, IA, USA. 5. Department of Pediatrics, Stanford University, Palo Alto, CA, USA. 6. Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA. 7. Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA. 8. Department of Public Health and Primary Health Care, University of Bergen, Bergen, Norway. 9. Centres for Disease Control and Prevention, Atlanta, GA, USA. 10. Department of Pediatrics, University of Iowa Hospitals and Clinics, Iowa City, IA, USA.
Abstract
Background: Evidence on association of maternal pre-pregnancy weight with risk of orofacial clefts is inconsistent. Methods: Six large case-control studies of orofacial clefts from Northern Europe and the USA were included in analyses pooling individual-level data. Cases included 4943 mothers of children with orofacial clefts (cleft lip only: 1135, cleft palate with cleft lip: 2081, cleft palate only: 1727) and controls included 10 592 mothers of unaffected children. Association of orofacial cleft risk with pre-pregnancy maternal weight classified by level of body mass index (BMI, kg/m 2 ) was evaluated using logistic regression adjusting for multiple covariates. Results: Cleft palate, both alone and with cleft lip (CP+/-CL), was associated with maternal class II+ pre-pregnancy obesity (≥ 35)compared with normal weight [adjusted odds ratio (aOR) = 1.36; 95% confidence interval (CI) = 1.16, 1.58]. CP+/-CL was marginally associated with maternal underweight (aOR = 1.16; 95% CI = 0.98, 1.36). Cleft lip alone was not associated with BMI. Conclusions: In this largest population-based study to date, we found an increased risk of cleft palate, with or without cleft lip, in class II+ obese mothers compared with normal-weight mothers; underweight mothers may also have an increased risk, but this requires further study. These results also suggest that extremes of weight may have a specific effect on palatal development.
Background: Evidence on association of maternal pre-pregnancy weight with risk of orofacial clefts is inconsistent. Methods: Six large case-control studies of orofacial clefts from Northern Europe and the USA were included in analyses pooling individual-level data. Cases included 4943 mothers of children with orofacial clefts (cleft lip only: 1135, cleft palate with cleft lip: 2081, cleft palate only: 1727) and controls included 10 592 mothers of unaffected children. Association of orofacial cleft risk with pre-pregnancy maternal weight classified by level of body mass index (BMI, kg/m 2 ) was evaluated using logistic regression adjusting for multiple covariates. Results:Cleft palate, both alone and with cleft lip (CP+/-CL), was associated with maternal class II+ pre-pregnancy obesity (≥ 35)compared with normal weight [adjusted odds ratio (aOR) = 1.36; 95% confidence interval (CI) = 1.16, 1.58]. CP+/-CL was marginally associated with maternal underweight (aOR = 1.16; 95% CI = 0.98, 1.36). Cleft lip alone was not associated with BMI. Conclusions: In this largest population-based study to date, we found an increased risk of cleft palate, with or without cleft lip, in class II+ obese mothers compared with normal-weight mothers; underweight mothers may also have an increased risk, but this requires further study. These results also suggest that extremes of weight may have a specific effect on palatal development.
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