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Table 3 Associations between low birth weight, prematurity, and tobacco exposure

From: Prevalence of maternal smoking and environmental tobacco smoke exposure during pregnancy and impact on birth weight: retrospective study using Millennium Cohort

  Non-smoker, non ETS exposed Non-smoker ETS exposed Active smoker
Low birth weight N = 8091 N = 2256 N = 6395
Birth weight < 2.5 Kg % † 4.4 6.0 8.3
Crude Odds Ratio compared to Non-Smoker, Non ETS exposed (95% CI) 1 1.39 (1.10, 1.77)
p = 0.007
1.97 (1.68, 2.32)
p < 0.001
Adjusted Odds Ratio * (95% CI) 1 1.23 (0.96, 1.58)
p = 0.10
1.92 (1.60,2.29)
p < 0.001
Prematurity N = 8032 N = 2230 N = 6339
Gestation < 37 weeks % † 6.1 7.5 8.1
Crude Odds Ratio compared to Non-Smoker, Non ETS exposed (95% CI) 1 1.26 (1.01,1.57)
p = 0.04
1.36 (1.17, 1.58)
p < 0.001
Adjusted Odds Ratio * (95% CI) 1 1.21 (0.96, 1.51)
p = 0.11
1.25 (1.05, 1.48)
p = 0.013
  1. * Adjustment was made for Maternal Age, BMI, parity, alcohol use, maternal education, income, ethnicity, gestational diabetes
  2. † All results are adjusted for the sampling design