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Gordon C.S. Smith, MD, PhD, Imran Shah, MSc, Jill P. Pell, MD, Jennifer A. Crossley, PhD and Richard Dobbie, BSc

At the time of the study, Gordon C.S. Smith and Imran Shah were with the Department of Obstetrics and Gynaecology, Cambridge University, Cambridge, England. At the time of the study, Imran Shah was with the Department of Obstetrics and Gynaecology, Cambridge University, and Jill P. Pell was with the Department of Public Health, Greater Glasgow, Glasgow, Scotland. Jennifer A. Crossley was with the Institute of Medical Genetics, Glasgow. Richard Dobbie was with the Information and Statistics Division, National Health Service for Scotland, Glasgow.

View larger version (7K): [in this window] [in a new window] [Download PPT slide]   FIGURE 1—— Relationship between maternal body mass index (BMI) in early pregnancy in nulliparous and multiparous women and the proportion of spontaneous preterm births (a) and elective preterm births (b). Note. The 2 test for trend was significant at P < .001 for all associations except elective preterm birth among multiparous women (P = .12).