title: Placenta praevia and male sex at birth: results from a population-based study.
abstract: This study examined the relationship between male sex at birth and placenta praevia in 433031 mother/infant dyads (linked by a common institutional code and hospital admission number) in the Canadian province of Quebec, during the fiscal years of 1991/92-1995/96. The male-to-female ratio among pregnancies with and without placenta praevia was calculated and compared. The male-to-female ratio at birth was higher in pregnancies complicated by a placenta praevia (1.19) than in those without it (1.04; P < 0.02). This increased ratio persisted after accounting separately for the potential confounding and/or modifying effects of maternal age, infant birthweight and gestational age by stratified and multiple logistic regression analyses. We conclude that pregnant women with male babies carry a higher risk of placenta praevia.
authors: Bureau of Reproductive and Child Health, Laboratory Center for Disease Control, Health Canada, Ottawa, Ontario, Canada. Shi_Wu_Wen@hc-sc.gc.ca
authors: S W
authors: SW
authors: Wen
authors: K
authors: K
authors: Demissie
authors: S
authors: S
authors: Liu
authors: S
authors: S
authors: Marcoux
authors: M S
authors: MS
authors: Kramer
mesh_terms: D001724:Birth Weight; D015986:Confounding Factors, Epidemiologic; D005260:Female; D006801:Humans; D015994:Incidence; D007231:Infant, Newborn; D008297:Male; D008423:Maternal Age; D010923:Placenta Previa / Q000453:epidemiology* / Q000209:etiology; D011247:Pregnancy; D011792:Quebec / Q000453:epidemiology; D012189:Retrospective Studies; D012307:Risk Factors; D012737:Sex Factors