Risk factors | Placental abruption (N = 112; 0.3 %) | No abruption (N =39,881; 99.7 %) | Unadjusted OR (95 % CI) | Adjusted OR (95 % CI)a |
---|---|---|---|---|
Chronic hypertension |  |  | 4.5 (1.6–13.2) | 4.1 (1.3–12.8) |
 Yes | 3 (1.1) | 269 (98.9) |  |  |
 No | 109 (0.3) | 39,612 (99.7) |  |  |
Preeclampsia/eclampsiab |  |  | 2.5 (1.6–5.2) | 2.1 (1.1–4.1) |
 Yes | 9 (0.6) | 1622 (99.4) |  |  |
 No | 103 (0.3) | 38,259 (99.7) |  |  |
Multiple gestations | ||||
 Yes | 106 (0.28) | 37,664 (99.7) | 1.0 (0.5–2.3) | 0.8 (0.3–1.9) |
 No | 6 (0.27) | 2217(99.7) |  |  |
Previous caesarean -section |  |  | 1.5 (1.2–4.8) | 1.3 (1.2–4.2) |
 Yes | 22 (0.3) | 6947 (99.7) |  |  |
 No | 90 (0.12) | 32,934 (99.8) |  |  |
Previous abruptio placentaec |  |  | 3.8 (2.3–6.4) | 2.3 (1.8–3.4) |
 Yes | 49 (0.7) | 6658 (99.3) |  |  |
 No | 63 (0.19) | 33,223 (99.8) |  |  |
Antenatal care visits |  |  | 1.6 (1.2–2.6) | 1.3 (1.1–2.4) |
 <4 | 53 (0.4) | 13,315 (99.6) |  |  |
 ≥4 | 59 (0.2) | 26,566 (99.8) |  |  |
Gravidity |  |  | 2.2 (1.4–3.6) | 2.1 (1.2–3.5) |
 Multigravida | 90 (0.3) | 27,766 (99.7) |  |  |
 Primigravida | 22 (0.18) | 12,115 (99.8) |  |  |
Parity |  |  | 1.7 (1.4–10.5) | 1.4 (1.2–8.6) |
 ≥2 | 65 (0.36) | 17,836 (99.6) |  |  |
 <2 | 47 (0.2) | 22,045 (99.8) |  |  |
Sex of the baby | ||||
 Male | 62 (0.3) | 20,580 (99.7) | 1.2 (0.9–1.7) | 1.03(0.7–1.5) |
 Female | 50 (0.25) | 19,301 (99.75) |  |  |