Table 4 Association between antepartum depressive and anxiety symptoms and PTB
| Â | Final model | Stratified model | |
|---|---|---|---|
aRR (95% CI) | East coast aRR (95% CI) | West coast aRR (95% CI) | |
Model I | |||
 Underweight | 3..61 (1.60–8.14) | 9.53 (4.31–21.05) | – |
 Physical abuse ever | 3.50 (1.41–8.67) | – | 6.63 (1.92–22.91) |
 Antepartum depressive symptoms | 2.36 (1.12–4.99) | – | – |
Model II | |||
 Underweight | 4.97 (2.33–10.63) | 7.39 (3.25–16.78) | – |
 Physical abuse ever | 5.24 (2.25–12.21) | – | 6.63 (1.92–22.91) |
 Antepartum anxiety symptoms | – | 2.49 (1.16–5.36) | – |