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Table 4 Stratification analyses by smoking before pregnancy for the likelihood for total and recurrent spontaneous abortion (SA) by body mass index (BMI) at 18–20 years old in the Health Examinee 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) Smokers before pregnancy Never-smokers before pregnancy
SA OR1 (95% CI)1 SA OR1 (95% CI)1
N (%) N (%)
<18.5 34 (26.0) 1.31 (0.70–2.44) 3,060 (17.5) 1.09 (1.05–1.15)
18.5–22.9 49 (67.1) 1.00 (ref) 12,249 (69.9) 1.00 (ref)
23–24.9 3 (4.1) 0.70 (0.12–1.40) 1,666 (9.5) 0.94 (0.89–1.00)
≥25 2 (2.7) 0.74 (0.15–3.59) 545 (3.1) 1.05 (0.95–1.16)
  1. 1Adjusted by age, education, smoking before pregnancy, drinking status and first pregnancy age