Table 2.
Parental smoking during pregnancy correlated with birthweight (g) and low birthweight
| Linear regression | Logistic regression | |||
|---|---|---|---|---|
| Birthweight | p | Low birthweight | p | |
| Mean ± SE | OR (95% CI) | |||
| Parental smoking during pregnancya | ||||
| Neither parent | 3057 ± 16.2 | - | 1.00 | - |
| Only father | 3094 ± 9.1 | 0.047 | 0.89 (0.51-1.54) | 0.665 |
| Only mother | 2921 ± 52.2 | 0.013 | 2.58 (0.75-8.90) | 0.135 |
| Both parents | 2973 ± 47.6 | 0.096 | 2.37 (0.51-10.92) | 0.270 |
| Paternal smoking amountb | ||||
| None | 3051 ± 16.2 | - | 1.00 | - |
| 1-10 cigarettes/day | 3108 ± 14.2 | 0.009 | 0.81 (0.58-1.14) | 0.230 |
| 11-20 cigarettes/day | 3094 ± 14.1 | 0.044 | 0.66 (0.46-0.94) | 0.022 |
| >20 cigarettes/day | 2900 ± 28.8 | <0.001 | 2.09 (1.38-3.17) | <0.001 |
| Maternal smoking amountb | ||||
| None | 3085 ± 8.7 | - | 1.00 | - |
| 1-10 cigarettes/day | 2968 ± 51.2 | 0.025 | 1.66 (0.84-3.27) | 0.144 |
| >10 cigarettes/day | 2734 ± 76.4 | <0.001 | 4.07 (1.88-8.82) | <0.001 |
| Smoking amount in both parentsb | ||||
| None | 3067 ± 16.9 | - | 1.00 | - |
| 1-20 cigarettes/day | 3095 ± 10.0 | 0.154 | 0.95 (0.69-1.31) | 0.747 |
| >20 cigarettes/day | 2911 ± 26.4 | <0.001 | 2.24 (1.47-3.41) | <0.001 |
Note. SE = standard error; OR = odds ratio; CI = confidence interval.
aAdjusted for birth order, maternal age at delivery, maternal employment, parental BMI, and residence.
bAdjusted for birth order.