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Table 3 Stratification analyses by maternal age for the likelihood for total and recurrent spontaneous abortion (SA) of body mass index (BMI) at 18–20 years old in the Health Examinee Study (HEXA), 2004-20121

From: Body mass index at age 18–20 and later risk of spontaneous abortion in the Health Examinees Study (HEXA)

BMI (kg/m2) Maternal age
SA at ≤25 years SA at 26–28 years SA at >28 years
(N=3,980) (N=3,977) (N=4,321)
N (%) OR2 (95% CI) N (%) OR2 (95% CI) N (%) OR2 (95% CI)
<18.5 636 (16.0) 1.07 (0.97–1.17) 768 (19.3) 1.17 (1.08–1.27) 844 (19.5) 1.11 (1.02–1.21)
18.5–22.9 2,765 (69.5) 1.00 (ref) 2,761 (69.4) 1.00 (ref) 2,989 (69.2) 1.00 (ref)
23–24.9 427 (10.7) 1.02 (0.91–1.32) 356 (8.95) 0.92 (0.82–1.03) 376 (8.7) 0.93 (0.83–1.04)
≥25 153 (3.8) 1.22 (1.02–1.45) 92 (2.3) 0.82 (0.66–1.01) 112 (2.6) 0.96 (0.79–1.17)
  1. 1Only included participants who were enrolled between 2007 and 2012 due to lack of information in age at spontaneous abortion
  2. 2Adjusted for age, education, smoking before first pregnancy and drinking status