Cerebral palsy rates in singletons by birth weight, gestation and 5-year cohort for all cases and those with lifestyle assessment score (LAS) ≥30%
| Rate per 1000 neonatal survivors (n cases) | N (neonatal survivors) | RR (95% CI) | Rate LAS≥30% (n cases) | RR (95% CI) | ||||
|---|---|---|---|---|---|---|---|---|
| 1991–1995 | 1996–2000 | 1991–1995 | 1996–2000 | 1996–2000 vs 1991–1995 | 1991–1995 | 1996–2000 | 1996–2000 vs 1991–1995 | |
| Birthweight group (g) | ||||||||
| <1500 | 72.09 (79) | 75.49 (85) | 1082 | 1126 | 1.05 (0.78 to 1.41) | 62.54 (68) | 66.61 (75) | 1.06 (0.77 to 1.46) |
| 1500–2499 | 10.66 (93) | 8.91 (72) | 8722 | 8082 | 0.84 (0.62 to 1.13) | 9.76 (85) | 7.65 (62) | 0.79 (0.57 to 1.09) |
| ≥2500 | 1.49 (248) | 1.66 (240) | 165 957 | 144 867 | 1.11 (0.93 to 1.32) | 1.27 (211) | 1.29 (187) | 1.02 (0.83 to 1.24) |
| Total | 2.36 (419) | 2.57 (397) | 177 244 | 154 279 | 1.09 (0.95 to 1.25) | 2.05 (364) | 2.10 (324) | 1.03 (0.88 to 1.19) |
| Gestational age group (weeks) | ||||||||
| <28 | 60.47 (28) | 75.72 (29) | 463 | 383 | 1.25 (0.76 to 2.07) | 58.04 (27) | 71.81 (28) | 1.25 (0.75 to 2.09) |
| 28–31 | 52.20 (58) | 66.77 (64) | 1111 | 959 | 1.38 (0.91 to 1.80) | 44.83 (50) | 56.24 (54) | 1.25 (0.86 to 1.82) |
| 32–36 | 9.79 (81) | 9.20 (70) | 8276 | 7605 | 0.94 (0.68 to 1.29) | 8.52 (71) | 7.70 (59) | 0.90 (0.64 to 1.28) |
| 37–41 | 1.46 (230) | 1.49 (207) | 157 673 | 138 920 | 1.02 (0.84 to 1.23) | 1.25 (197) | 1.18 (165) | 0.95 (0.77 to 1.17) |
| ≥42 | 2.26 (22) | 4.47 (27) | 9721 | 6043 | 1.97 (1.13 to 3.46) | 2.01 (20) | 3.09 (19) | 1.53 (0.82 to 2.86) |