Table 2 Odds ratios (ORs) and 95% confidence intervals (CIs) for depressive symptoms during pregnancy in relation to smoking status in 1745 pregnant women, Kyushu Okinawa Maternal and Child Health Study, Japan, April 2007 to March 2008
Prevalence (%) | Crude OR (95% CI) | Adjusted OR (95% CI)a | |
|---|---|---|---|
Smoking status | |||
Never | 196/1183 (16.6) | 1.00 | 1.00 |
Former | 118/503 (23.5) | 1.54 (1.19–1.99) | 1.39 (1.06–1.83) |
Current | 21/59 (35.6) | 2.78 (1.57–4.80) | 2.49 (1.36–4.45) |
Pack-years of smoking | |||
None | 196/1183 (16.6) | 1.00 | 1.00 |
0.05–2.9 | 45/207 (21.7) | 1.40 (0.96–2.00) | 1.18 (0.80–1.72) |
3.0–7.9 | 56/222 (25.2) | 1.70 (1.20–2.37) | 1.55 (1.08–2.22) |
≥ 8.0 | 38/133 (28.6) | 2.01 (1.33–3.00) | 1.97 (1.26–3.03) |
P for trend | < .0001 | 0.0005 | |