Univariate analysis of antenatal risk factors for grades 3–4 IVH in 5712 infants, 1995–97
| Yes | No | |||
|---|---|---|---|---|
| Prenatal characteristic | Number (%) with major IVH | Number (%) with major IVH | Missing data (n) | Unadjusted OR (95% CI) |
| Transfer after birth | 78/597 (13.1%) | 306/5014 (6.1%) | 101 | 2.31 (1.77 to 3.01) |
| Prolonged rupture of membranes | 60/1198 (5.0%) | 329/4393 (7.5%) | 121 | 0.66 (0.49 to 0.87) |
| Preterm labour | 263/3280 (8.0%) | 131/2389 (5.5%) | 43 | 1.51 (1.21 to 1.87) |
| Pregnancy induced hypertension | 41/1036 (4.0%) | 347/4568 (7.6%) | 108 | 0.50 (0.36 to 0.70) |
| Antepartum haemorrhage | 107/1308 (8.2%) | 282/4296 (6.6%) | 108 | 1.27 (1.01 to 1.60) |
| Intrauterine growth retardation | 15/503 (3.0%) | 368/4946 (7.4%) | 263 | 0.38 (0.23 to 0.65) |
| Fetal distress | 79/955 (8.3%) | 309/4635 (6.7%) | 122 | 1.27 (0.98 to 1.63) |
| Antenatal corticosteroids | ||||
| Partial <24 hours | 93/1131 (8.2%) | 118/991 (11.9%) | 141 | 0.66 (0.50 to 0.88) |
| Complete and >7 days | 180/3449 (5.2%) | 118/991 (11.9%) | 0.40 (0.32 to 0.52) | |