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Table 4 Association between change in smoking behaviour during pregnancy (yes/no) and neonatal outcome, in mothers who smoked just before pregnancy

From: Pregnancy planning, smoking behaviour during pregnancy, and neonatal outcome: UK millennium cohort study

  Mothers who smoked just before pregnancy    
  Neonatal outcome in mothers Neonatal outcome in mothers Crude1 Adjusted 1* Adjusted 2**
  who did not change their who decreased or quit   
  smoking habit during pregnancy smoking during pregnancy    
n/N (%) n/N (%) OR (95% CI) OR (95% CI) OR (95% CI)
Low birth weight (<2.5 kg) 136/1,183(11.50) 365/4,834(7.55) 0.62 (0.50-0.79) 0.65 (0.50-0.84) 0.66 (0.51-0.85)
Prematurity (< 37 weeks gestation) 109/1,167 (9.34) 376/4,799 (7.83) 0.82 (0.65-1.03) 0.85 (0.67-1.08) 0.85 (0.67-1.09)
  1. 1Baseline group was women who did not change their smoking habit during pregnancy.
  2. *Birth weight adjusted for mother’s age, education, ethnicity, religion and BMI. Prematurity adjusted for mother’s age, relationship status and education.
  3. **Adjusted for the same variables as model 1 plus planning.