Table 4.
Unadjusted and adjusted odds of composite sleeping problems for offspring at 14 and 21 years by maternal smoking status
| Composite indicator of sleep problems | Maternal Smoking | Maternal Smoking | |||||
|---|---|---|---|---|---|---|---|
| 14 years maternal report of sleep | N | Never | Smoked postnatal but not in pregnancy and pre-pregnancy OR (95% CI) | Smoked in pregnancy + other times OR (95% CI) | Never | Smoked postnatal but not in pregnancy and pre-pregnancy OR (95% CI) | Smoked in pregnancy + other times OR (95% CI) |
| Unadjusted | Adjusteda | ||||||
| Lower 20% | 959 (28.03) | 1.00 | Reference | Reference | 1.00 | Reference | Reference |
| Middle 20–80% | 2000 (58.50) | 1.00 | 1.14 (0.77, 1.70) | 1.27 (1.08, 1.49) | 1.00 | 1.13 (0.75, 1.68) | 1.26 (1.05, 1.50) |
| Top 20% | 462 (13.50) | 1.00 | 1.85 (1.11, 3.11) | 1.63 (1.30, 2.05) | 1.00 | 1.71 (1.00, 2.89) | 1.36 (1.05, 1.76) |
| 14 years youth report of sleep | |||||||
| Lower 20% | 854 (25.08) | 1.00 | Reference | Reference | 1.00 | Reference | Reference |
| Middle 20–80% | 1924 (56.51) | 1.00 | 0.73 (0.50, 1.09) | 1.11 (0.94, 1.31) | 1.00 | 0.74 (0.50, 1.10) | 1.13 (0.94, 1.36) |
| Top 20% | 627 (18.41) | 1.00 | 0.97 (0.60, 1.59) | 1.29 (1.05, 1.60) | 100 | 0.95 (0.58, 1.57) | 1.29 (1.02, 1.64) |
| 21 years report of sleep | |||||||
| Lower 20% | 745 (31.91) | 1.00 | Reference | Reference | 1.00 | Reference | Reference |
| Middle 20–80% | 1193 (51.09) | 1.00 | 0.78 (0.48, 1.26) | 1.15 (0.95, 1.40) | 1.00 | 0.74 (0.45, 1.22) | 1.10 (0.89, 1.37) |
| Top 20% | 397 (17.00) | 1.00 | 0.69 (0.34, 1.40) | 1.23 (0.96, 1.59) | 1.00 | 0.58 (0.28, 1.18) | 1.06 (0.80, 1.42) |
aAdjusted for coffee, tea, alcohol in late pregnancy, maternal age, maternal education, family income, planning of pregnancy and breastfeeding
Odds ratios in bold are significantly different to those of the reference category (P<.05)