Antenatal and perinatal risk factors for poor school performance
| Risk factor | No (%) cases (n=34) | No (%) controls (n=80) |
Odds ratio (95% CI) |
| Multiparity5-150 | 20 (58.8) | 30/79 (40.0) | 2.33 (1.0 to 5.3) |
| Induced conception5-150 | 4/33 (12.1) | 9/76 (11.8) | 1.03 (0.29 to 3.6) |
| Pre-eclamptic toxaemia (PET) | 8 (23.5) | 14 (17.5) | 1.45 (0.5 to 3.9) |
| Severe PET | 7 (20.6) | 5 (6.2) | 3.9 (1.1 to 13.3) |
| History of antepartum haemorrhage (APH)5-150 | 11 (32.3) | 24/79 (30.3) | 1.1 (0.5 to 2.6) |
| APH <20 weeks5-150 | 8 (23.5) | 10/78 (12.8) | 2.09 (0.7 to 5.9) |
| Prolonged rupture of membranes5-150 | 5 (14.7) | 13/78 (16.7) | 0.86 (0.3 to 2.6) |
| Multiple pregnancy | 7 (20.6) | 14 (17.5) | 1.22 (0.4 to 3.4) |
| Non-cephalic presentation | 8 (23.5) | 11 (13.8) | 1.93 (0.7 to 5.3) |
| Interventional delivery | 23 (67.6) | 35 (43.8) | 2.69 (1.2 to 6.3) |
| Cord arterial gas <7.255-150 | 10/21 (47.6) | 25/51 (49.0) | 0.95 (0.3 to 2.6) |
| Cord arterial gas <7.15-150 | 2/21 (9.5) | 4/51 (7.8) | 1.2 (0.2 to 7.3) |
↵5-150 Data not available for some babies.