Title: Childbearing is not associated with young women's long-term obesity risk.

Authors: Robinson, Whitney R; Cheng, Mariah M; Hoggatt, Katherine J; Stürmer, Til; Siega-Riz, Anna M

Published In Obesity (Silver Spring), (2014 Apr)

Abstract: Contemporary childbearing is associated with greater gestational weight gain and postpartum weight retention than in previous decades, potentially leading to a more pronounced effect of childbearing on women's long-term obesity risk. Previous work on the association of childbearing with women's long-term obesity risk mostly examined births in the 1970s and 1980s and produced mixed results. The association of childbearing and obesity incidence in a diverse, contemporary sample of 2731 US women was estimated.Propensity-score (PS) matching was used for confounding control when estimating the effect of incident parity (1996-2001) on 7-year incident obesity (BMI≥30 kg/m(2) ) (2001-2008).In the sample, 19.3% of parous women became obese, whereas 16.1% of unmatched nulliparous women did. After PS matching without and with replacement, the differences in obesity incidence were, respectively, 0.0 percentage points (ppts) (95% CI: -4.7 to 4.7) and 0.9 ppts (95% CI: -4.9 to 6.7). Results were similar in analyses of prevalent parity and obesity in 2008 (n = 6601) conducted to explore possible selection bias.These results imply that, in contemporary US parous women in their late 20s and early 30s, childbearing may not increase obesity incidence.

PubMed ID: 23929637

MeSH Terms: No MeSH terms associated with this publication