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Effect of Body Mass Index on pregnancy outcomes in nulliparous women delivering singleton babies.
BMC Public Health 2007; 7:168BP

Abstract

BACKGROUND

The increasing prevalence of obesity in young women is a major public health concern. These trends have a major impact on pregnancy outcomes in these women, which have been documented by several researchers. In a population based cohort study, using routinely collected data, this paper examines the effect of increasing Body Mass Index (BMI) on pregnancy outcomes in nulliparous women delivering singleton babies.

METHODS

This was a retrospective cohort study, based on all nulliparous women delivering singleton babies in Aberdeen between 1976 and 2005. Women were categorized into five groups--underweight (BMI < 20 Kg/m2), normal (BMI 20-24.9 Kg/m2) overweight (BMI 25-29.9 Kg/m2), obese (BMI 30-34.9 Kg/m2) and morbidly obese (BMI > 35 Kg/m2). Obstetric and perinatal outcomes were compared by univariate and multivariate analyses.

RESULTS

In comparison with women of BMI 20-24.9, morbidly obese women faced the highest risk of pre-eclampsia {OR 7.2 (95% CI 4.7, 11.2)} and underweight women the lowest {OR 0.6 (95% CI 0.5, 0.7)}. Induced labour was highest in the morbidly obese {OR 1.8 (95% CI 1.3, 2.5)} and lowest in underweight women {OR 0.8 (95% CI 0.8, 0.9)}. Emergency Caesarean section rates were highest in the morbidly obese {OR 2.8 (95% CI 2.0, 3.9)}, and comparable in women with normal and low BMI. Obese women were more likely to have postpartum haemorrhage {OR 1.5 (95% CI 1.3, 1.7)} and preterm delivery (< 33 weeks) {OR 2.0 (95% CI 1.3, 2.9)}. Birthweights less than 2,500 g were more common in underweight women {OR 1.7 (95% OR 1.2, 2.0)}. The highest risk of birth weights > 4,000 g was in the morbidly obese {OR 2.1 (95% CI 1.3, 3.2)} and the lowest in underweight women {OR 0.5 (95% CI 0.4, 0.6)}.

CONCLUSION

Increasing BMI is associated with increased incidence of pre-eclampsia, gestational hypertension, macrosomia, induction of labour and caesarean delivery; while underweight women had better pregnancy outcomes than women with normal BMI.

Authors+Show Affiliations

Dugald Baird Centre for Research on Women's Health, Aberdeen Maternity Hospital, Aberdeen, UK. sohinee.bhattacharya@abdn.ac.ukNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17650297

Citation

Bhattacharya, Sohinee, et al. "Effect of Body Mass Index On Pregnancy Outcomes in Nulliparous Women Delivering Singleton Babies." BMC Public Health, vol. 7, 2007, p. 168.
Bhattacharya S, Campbell DM, Liston WA, et al. Effect of Body Mass Index on pregnancy outcomes in nulliparous women delivering singleton babies. BMC Public Health. 2007;7:168.
Bhattacharya, S., Campbell, D. M., Liston, W. A., & Bhattacharya, S. (2007). Effect of Body Mass Index on pregnancy outcomes in nulliparous women delivering singleton babies. BMC Public Health, 7, p. 168.
Bhattacharya S, et al. Effect of Body Mass Index On Pregnancy Outcomes in Nulliparous Women Delivering Singleton Babies. BMC Public Health. 2007 Jul 24;7:168. PubMed PMID: 17650297.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of Body Mass Index on pregnancy outcomes in nulliparous women delivering singleton babies. AU - Bhattacharya,Sohinee, AU - Campbell,Doris M, AU - Liston,William A, AU - Bhattacharya,Siladitya, Y1 - 2007/07/24/ PY - 2007/03/15/received PY - 2007/07/24/accepted PY - 2007/7/26/pubmed PY - 2007/9/20/medline PY - 2007/7/26/entrez SP - 168 EP - 168 JF - BMC public health JO - BMC Public Health VL - 7 N2 - BACKGROUND: The increasing prevalence of obesity in young women is a major public health concern. These trends have a major impact on pregnancy outcomes in these women, which have been documented by several researchers. In a population based cohort study, using routinely collected data, this paper examines the effect of increasing Body Mass Index (BMI) on pregnancy outcomes in nulliparous women delivering singleton babies. METHODS: This was a retrospective cohort study, based on all nulliparous women delivering singleton babies in Aberdeen between 1976 and 2005. Women were categorized into five groups--underweight (BMI < 20 Kg/m2), normal (BMI 20-24.9 Kg/m2) overweight (BMI 25-29.9 Kg/m2), obese (BMI 30-34.9 Kg/m2) and morbidly obese (BMI > 35 Kg/m2). Obstetric and perinatal outcomes were compared by univariate and multivariate analyses. RESULTS: In comparison with women of BMI 20-24.9, morbidly obese women faced the highest risk of pre-eclampsia {OR 7.2 (95% CI 4.7, 11.2)} and underweight women the lowest {OR 0.6 (95% CI 0.5, 0.7)}. Induced labour was highest in the morbidly obese {OR 1.8 (95% CI 1.3, 2.5)} and lowest in underweight women {OR 0.8 (95% CI 0.8, 0.9)}. Emergency Caesarean section rates were highest in the morbidly obese {OR 2.8 (95% CI 2.0, 3.9)}, and comparable in women with normal and low BMI. Obese women were more likely to have postpartum haemorrhage {OR 1.5 (95% CI 1.3, 1.7)} and preterm delivery (< 33 weeks) {OR 2.0 (95% CI 1.3, 2.9)}. Birthweights less than 2,500 g were more common in underweight women {OR 1.7 (95% OR 1.2, 2.0)}. The highest risk of birth weights > 4,000 g was in the morbidly obese {OR 2.1 (95% CI 1.3, 3.2)} and the lowest in underweight women {OR 0.5 (95% CI 0.4, 0.6)}. CONCLUSION: Increasing BMI is associated with increased incidence of pre-eclampsia, gestational hypertension, macrosomia, induction of labour and caesarean delivery; while underweight women had better pregnancy outcomes than women with normal BMI. SN - 1471-2458 UR - https://www.unboundmedicine.com/medline/citation/17650297/Effect_of_Body_Mass_Index_on_pregnancy_outcomes_in_nulliparous_women_delivering_singleton_babies_ L2 - https://bmcpublichealth.biomedcentral.com/articles/10.1186/1471-2458-7-168 DB - PRIME DP - Unbound Medicine ER -