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Table 2 Logistic regression for having spontaneous abortions (SAs) at age 18–20 from the Health Examinees Study (HEXA), 2004–2012

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

BMI (kg/m2) Total women Total women with a history of at least Comparison by groups
  (N=80,447) One abortion Two abortion Three abortion ≥1 SAs vs. No. SA ≥2 SAs vs. 0–1 SA ≥3 SAs vs. 0–2 SA
(N=17,180) (N=4,875) (N=1,704)
  N N (%) N (%) N (%) OR1 (95% CI) OR1 (95% CI) OR1 (95% CI)
<18.5 13128 3,122 (17.5) 896 (18.38) 335 (19.7) 1.10 (1.05–1.15) 1.14 (1.06–1.23) 1.29 (1.14–1.46)
18.5–22.9 56692 12,462 (70.0) 3,380 (69.3) 1,149 (67.4) 1.00 (ref) 1.00 (ref) 1.00 (ref)
23–24.9 8148 1,675 (9.4) 438 (9.0) 148 (8.7) 0.93 (0.88–0.99) 0.91 (0.82–1.01) 0.88 (0.74–1.04)
≥25 2479 551 (3.1) 161 (3.3) 72 (4.2) 1.06 (0.96–1.16) 1.13 (0.96–1.33) 1.39 (1.09–1.78)
  1. 1Adjusted for age, education, smoking before first pregnancy, drinking status and first pregnancy age