Severe obesity doubles risk of preterm delivery, study shows

BMJ 2012; 345 doi: (Published 31 October 2012) Cite this as: BMJ 2012;345:e7338
  1. Anders Hansen
  1. 1Stockholm

Being obese increases the risk of preterm birth, with the heaviest women (body mass index of 40 or more) nearly twice as likely to deliver before 37 weeks of gestation as women whose weight was normal, a study has found.

For the study, researchers from Sahlgrenska University Hospital in Gothenburg used data from the Norwegian mother and child cohort study to look at 83 544 pregnancies that occurred between 1999 and 2008.1 Information on weight and height before pregnancy …

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