Table 4 Association between level of tobacco smoke exposure during pregnancy and birth weight (Kg)
| Â | 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) | Â | Â | Â | Â |
Non-smoker or no partner | 3.448 (0.007) | - | - | Â |
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) | Â |
Active Smoker (Level of Maternal cigarette consumption) | Â | Â | Â | Â |
Non-smoker | 3.429 (0.006) | - | - | Â |
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) | Â |