Table 3

Unadjusted and adjusted OR (95% CI) of perinatal outcomes in women with singleton births according to smoking status groups (logistic regression analysis)

Outcome/characteristicNon-smoking (reference)Quit smokingSmokingNo information on smoking
Outcomes according to SESPer centPer centUnadjusted ORAdjusted ORPer centUnadjusted ORAdjusted ORPer centUnadjusted ORAdjusted OR
Admission to a neonatal unit*8.310.21.25 (1.20 to 1.30)1.19 (1.15 to 1.24)9.91.21 (1.19 to 1.23)1.27 (1.25 to 1.30)8.61.04 (1.00 to 1.08)1.16 (1.11 to 1.21)
Stillbirth†0.80.50.70 (0.60 to 0.81)1.07 (0.92 to 1.26)0.81.03 (0.97 to 1.10)1.13 (1.06 to 1.20)0.91.19 (1.05 to 1.34)1.09 (0.97 to 1.24)
Prematurity (<37 weeks)†4.34.51.04 (0.98 to 1.10)1.01 (0.95 to 1.07)5.71.35 (1.31 to 1.38)1.39 (1.36 to 1.43)7.91.89 (1.81 to 1.98)1.83 (1.75 to 1.92)
LBW (<2500 g)†2.93.21.14 (1.07 to 1.21)1.09 (1.02 to 1.16)5.41.93 (1.88 to 1.98)2.02 (1.97 to 2.07)6.12.21 (2.11 to 2.33)2.14 (2.03 to 2.25)
SGA (<−2SD)†3.04.01.33 (1.26 to 1.41)1.16 (1.09 to 1.23)6.92.38 (2.33 to 2.44)2.47 (2.41 to 2.53)4.11.39 (1.31 to 1.47)1.45 (1.36 to 1.54)
Major congenital anomaly†3.33.91.20 (1.13 to 1.27)1.22 (1.15 to 1.30)3.51.09 (1.06 to 1.12)1.13 (1.09 to 1.16)3.91.20 (1.14 to 1.28)1.19 (1.12 to 1.27)
  • *ORs (95% CIs) adjusted for maternal age, parity, sex, preeclampsia and gestational diabetes.

  • †ORs (95% CI) adjusted for maternal age, parity, sex and socioeconomic status.

  • LBW, low birth weight; SGA, small for gestational age.