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Table 4 Association between level of tobacco smoke exposure during pregnancy and birth weight (Kg)

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

  Mean birth weight (SE) Mean difference from non-smoker (95% CI) Adjusted mean difference from non-smoker (95% CI) P value for trend
ETS exposure (Level of partner cigarette consumption in non-smokers)     
Non-smoker or no partner 3.448 (0.007) - -  
Smoker 1–10 cigs/day 3.386 (0.020) -0.062 (-0.103, -0.021) -0.027 (-0.067, 0.014) 0.007
Smoker 11–20 cigs/day 3.390 (0.024) -0.058 (-0.107, -0.008) -0.053 (-0.101, -0.004)  
Smoker 20+ cigs/day 3.407 (0.042) -0.040 (-0.124, 0.044) -0.059 (-0.141, 0.023)  
Active Smoker (Level of Maternal cigarette consumption)     
Non-smoker 3.429 (0.006) - -  
Smoker 1–10 cigs/day 3.325 (0.012) -0.104 (-0.130, -0.078) -0.086 (-0.114, -0.059) < 0.001
Smoker 11–20 cigs/day 3.239 (0.014) -0.190 (-0.220, -0.160) -0.190 (-0.221, -0.159)  
Smoker 20+ cigs/day 3.152 (0.032) -0.277 (-0.342, -0.213) -0.275 (-0.341, -0.209)