Absolute risk and relative risk of severe PPD
| PH and FH | Absolute risk | Relative risk | |||
| PPD cases | n | Absolute risk (%) (95% CI) | Crude RR (95% CI) | Adjusted* RR (95% CI) | |
| PHno, FHno | 89 | 33 218 | 0.3% (0.2%; 0.3%) | Reference | Reference |
| PHno, FHyes | 316 | 67 382 | 0.5% (0.4%; 0.5%) | 1.75 (1.38; 2.21) | 1.70 (1.35; 2.15) |
| Less severe FH | 287 | 61 724 | 0.5% (0.4%; 0.5%) | 1.74 (1.37; 2.20) | 1.70 (1.34; 2.15) |
| Severe FH | 29 | 5658 | 0.5% (0.5%; 0.6%) | 1.91 (1.26; 2.91) | 1.79 (1.18; 2.73) |
| PHyes, FHno | 142 | 8535 | 1.7% (1.6%; 1.7%) | 6.21 (4.77; 8.09) | 5.90 (4.53; 7.69) |
| Less severe PH | 131 | 8145 | 1.6% (1.5%; 1.7%) | 6.00 (4.59; 7.85) | 5.76 (4.40; 7.53) |
| Severe PH | 11 | 390 | 2.8% (2.7%; 2.9%) | 10.53 (5.66; 19.57) | 9.01 (4.81; 16.85) |
| PHyes, FHyes | 720 | 32 929 | 2.2% (2.1%; 2.3%) | 8.16 (6.55; 10.17) | 7.40 (5.93; 9.25) |
| Less severe PH, less severe FH | 566 | 27 408 | 2.1% (2.0%; 2.1%) | 7.71 (6.17; 9.64) | 7.14 (5.70; 8.94) |
| Severe PH, less severe FH | 64 | 1554 | 4.1% (4.0%; 4.2%) | 15.37 (11.17; 21.16) | 12.59 (9.08; 17.45) |
| Less severe PH, severe FH | 80 | 3600 | 2.2% (2.2%; 2.3%) | 8.30 (6.14; 11.20) | 7.28 (5.38; 9.86) |
| Severe PH, severe FH | 10 | 367 | 2.7% (2.6%; 2.8%) | 10.17 (5.32; 19.43) | 8.03 (4.17; 15.43) |
*Adjusted for maternal age, parity, educational attainment and calendar year of delivery.
FH, family history of psychiatric disorders; PH, personal history of psychiatric disorders; PPD, postpartum depression; RR, relative risk.