Maternal body-mass index and odds ratios for low Apgar scores at 5 and 10 minutes: live singleton term births in Sweden 1992–2010.

aBoth models are adjusted for maternal country of birth, smoking in early pregnancy, education, parity, height, maternal age, and year of infant birth. Number of births included in the analysis was for Apgar score 0–3 at 5 minutes: crude model n = 1,512,506 births, model 1 n = 1,462,187 births, and model 2 n = 1,374,148 births. For Apgar score 0–3 at 10 minutes, the corresponding numbers were n = 1,504,050; n = 1,451,501; and n = 1,366,720, respectively.bWomen with any type of diabetes, chronic hypertension, preeclampsia, or having infants with malformations are excluded.