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Table 2 Adjusted odds ratio of parental smoking status for preterm birth

From: Paternal smoking and preterm birth: a population-based retrospective cohort study among non-smoking women aged 20–49 years in rural China

Smoking amounts No. (%) OR (95% CI)
Model Ia Model IIb Model IIIc
Neither-smoker 3,760,013 (7.46) 1 [Reference] 1 [Reference] 1 [Reference]
Paternal-only 1,538,030 (8.12) 1.09 (1.08–1.10) 1.05 (1.04–1.06) 1.04 (1.03–1.04)
Maternal-only 3357 (8.25) 1.10 (0.98–1.23) 1.09 (0.96–1.22) 1.08 (0.96–1.22)
Mixed 8281 (8.57) 1.14 (1.06–1.23) 1.11 (1.03–1.20) 1.11 (1.03–1.19)
  1. This analysis was conducted before excluding participants with maternal smoking or missing such information
  2. aORs were adjusted by maternal age at last menstrual period
  3. bORs were adjusted by maternal and paternal age at last menstrual period, maternal higher education, Han ethnic, preconception body mass index and alcohol drinking
  4. cORs were adjusted by paternal and maternal age at last menstrual period, maternal higher education, Han ethnic, body mass index, alcohol drinking, thyroid stimulating hormone, diabetes, hypertension, parity, history of adverse pregnancy outcomes, and region of service station