This paper was presented in part at the 20th Annual Meeting of the International Federation of Gynecology and Obstetrics (FIGO), Rome, Italy, 12–17 October 2012.
Risk of obstetric anal sphincter lacerations among obese women†
Article first published online: 2 MAY 2013
© 2013 The Authors BJOG An International Journal of Obstetrics and Gynaecology © 2013 RCOG
BJOG: An International Journal of Obstetrics & Gynaecology
Volume 120, Issue 9, pages 1110–1115, August 2013
How to Cite
Risk of obstetric anal sphincter lacerations among obese women. BJOG 2013;120:1110–1115., .
- Issue published online: 9 JUL 2013
- Article first published online: 2 MAY 2013
- Manuscript Accepted: 23 FEB 2013
- Anal sphincter tears;
To assess the risk for obstetric anal sphincter lacerations in relation to maternal obesity among primiparous women in Sweden.
A population-based study.
All women with vaginal delivery and singleton pregnancy in Sweden in the years 2003–2008 (n = 210 678).
The Medical Birth Registry, the National Board of Health and Welfare, was used to identify cases of rupture and body mass index (BMI) classes. The population was categorised into four classes with BMI of <25, 25 to <30, 30 to <35 and >35 kg/m2.
Main outcome measures
Odds ratios were estimated with 95% confidence intervals. In order to estimate the effect of BMI on obstetric anal sphincter lacerations, with possible confounders accounted for, uni- and multivariate logistic regressions were performed.
In total, 8958 (4.25%) cases of anal sphincter lacerations (grade III–IV) occurred; increasing BMI showed a significant near-dose–response type of protective effect against grade III–IV lacerations when compared with women with BMI <25 kg/m2: BMI 25 to <30 kg/m2, 0.89; BMI 30 to <35 kg/m2, 0.84; BMI > 35 kg/m2, 0.70.
Overweight and obesity were associated with a decreased risk for obstetric anal sphincter lacerations.