Maternal obesity, length of gestation, risk of postdates pregnancy and spontaneous onset of labour at term.

BJOG : an International Journal of Obstetrics and Gynaecology
F C DenisonW A Liston

Abstract

To investigate the effect of maternal body mass index (BMI) on postdates pregnancy, length of gestation and likelihood of spontaneous onset of labour at term. Retrospective cohort study. Swedish Medical Birth Register. A total of 186 087 primiparous women (of whom 143 519 had spontaneous onset of labour at term) who gave birth between 1998 and 2002. Mann-Whitney test, one-way analysis of variance, linear regression and single variable logistic regression. Postdates pregnancy (>/=294 days or 42(+0) weeks), length of gestation and likelihood of spontaneous onset of labour at term. About 6.8% of pregnancies delivered postdates. Higher maternal BMI (kg/m(2)) during the first trimester was associated with longer gestation (P < 0.001) as was a greater change in BMI between the first and third trimesters (BMI measured on admission prior to delivery) with mean (SD) gestation at delivery of 280.7 (8.6) and 283.2 (8.6) days for increases in BMI of <2 and >/=10 kg/m(2), respectively. Higher BMI during the first trimester was associated with a lower chance of spontaneous onset of labour at term. Compared with BMI 20 to <25 kg/m(2), the odds ratios (95% CI) for spontaneous onset of labour at term were 1.21 (1.15-1.27) for BMI of <20 kg/m(2)...Continue Reading

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