Table 1.
Baseline characteristics of 352,608 mothers (development dataset) and 108,849 women (validation dataset).
| Development dataset (1997–2012) | Validation dataset (2013–2015) | |||
|---|---|---|---|---|
| Overall | PPD | Overall | PPD | |
| N (%) | 352,608 (100) | 6402 (1.8) | 108,849 (100) | 2379 (2.2) |
| CORE MODEL | ||||
| Mothers’ age at birth, median (IQR) | 28 (25, 31) | 28 (25, 32) | 28 (25, 31) | 29 (26, 33) |
| Cohabitation (%) | 395,051 (83.7) | 5064 (79.1) | 89,089 (81.8) | 1886 (77.3) |
| Education (%) | ||||
| Mandatory | 68,451 (19.4) | 1723 (26.9) | 16,460 (15.1) | 532 (22.4) |
| Short | 165,907 (47.1) | 2855 (44.6) | 41,383 (38.0) | 912 (38.3) |
| Medium | 16,340 (4.6) | 221 (3.5) | 5342 (4.9) | 106 (4.5) |
| High | 101,910 (28.9) | 1603 (25.0) | 45,664 (42.0) | 829 (34.8) |
| Previous psychiatric history (%) | ||||
| None | 282,076 (80.0) | 1648 (25.7) | 73,467 (67.5) | 315 (13.2) |
| 0-3 years before birth | 19,848 (5.6) | 1585 (24.8) | 6519 (6.0) | 576 (24.2) |
| 3-10 years before birth | 41,075 (11.6) | 2788 (43.5) | 20,446 (18.8) | 1130 (47.5) |
| 10+ years before birth | 9609 (2.7) | 381 (6.0) | 8417 (7.7) | 358 (15.0) |
| ADDED PREDICTOR VARIABLES IN THE EXTENDED MODEL | ||||
| Postpartum hemorrhage (%) | 21,429 (6.1) | 527 (8.2) | 2,485 (2.3) | 59 (2.5) |
| Gestational diabetes (%) | 6531 (1.9) | 219 (3.4) | 3870 (3.6) | 141 (5.9) |
| Gestational hypertension (%) | 6835 (2.0) | 171 (2.7) | 3153 (2.9) | 84 (3.5) |
| Preeclampsia (%) | 15,055 (4.3) | 363 (5.7) | 5083 (4.7) | 149 (6.3) |
| Eclampsia (%) | 241 (0.1) | 9 (0.1) | 89 (0.1) | 0 (0.0) |
| Previous stillbirths (%) | 1881 (0.5) | 37 (0.6) | 474 (0.4) | 14 (0.6) |
| Previous abortion (%) | 82,709 (23.5) | 1792 (28.0) | 23,764 (21.8) | 625 (26.3) |
| Acute C-section (%) | 52,896 (15.0) | 1262 (19.7) | 16,934 (15.6) | 457 (19.2) |
| Preterm birth (%) | 22,226 (6.3) | 609 (9.5) | 5265 (4.8) | 204 (8.6) |
| Hyperemesis gravidarum (%) | 4899 (1.4) | 200 (3.1) | 2562 (2.4) | 131 (5.5) |
| ADDED PREDICTOR VARIABLES IN THE EXTENDED+ MODEL | ||||
| Parents’ previous psychiatric history (%) | 219,854 (62.4) | 4967 (77.6) | 82,260 (75.6) | 2071 (87.1) |
| Charlson comorbidity index, within 10 years before birth (%) | ||||
| 0 | 337,084 (95.6) | 5944 (92.8) | 102,589 (94.2) | 2206 (92.7) |
| 1 | 12,092 (3.4) | 370 (5.8) | 4779 (4.4) | 130 (5.5) |
| 2+ | 3432 (1.0) | 88 (1.4) | 1481 (1.4) | 43 (1.8) |
PPD is defined within 6 months after birth.