| Final model | Stratified model | |
---|---|---|---|
aRR (95% CI) | East coast aRR (95% CI) | West coast aRR (95% CI) | |
Model I | |||
 Primipara | 1.34 (1.02–1.76) | 1.47 (1.01–2.15) | – |
 Women’s BMI | 1.04 (1.02–1.06) | 1.03 (1.01–1.06) | – |
 Gestational age | 0.86 (0.79–0.93) | 0.79 (0.71–0.87) | – |
 Complications during delivery | 3.29 (2.09–5.20) | 6.10 (3.30–11.26) | 2.05 (1.03–4.08) |
 Antepartum depressive symptoms | 1.55 (1.06–2.26) | – | 2.44 (1.48–4.03) |
Model II | |||
 Primipara | 1.33 (1.01–1.75) | 1.47 (1.01–2.15) | – |
 Women’s BMI | 1.04 (1.02–1.06) | 1.03 (1.01–1.06) | – |
 Gestational age | 0.86 (0.79–0.93) | 0.79 (0.71–0.87) | – |
 Complications during delivery | 3.73 (2.40–5.81) | 6.10 (3.30–11.26) | 2.84 (1.47–5.47) |
 Antepartum anxiety symptoms | – | – | – |