Birthweight specific cerebral palsy (CP) prevalence in infant survivors of twin maternities
| Birthweight group | No of survivors | No of responders (response rate) | No with CP | CP prevalence per 1000 |
|---|---|---|---|---|
| Not stated | 499 | 316 (63%) | 1 | 3.2 |
| <1000 g | 452 | 297 (66%) | 26 | 87.5 |
| 1000–1499 g | 1743 | 973 (56%) | 29 | 29.8 |
| 1500–1999 g | 4362 | 2398 (55%) | 23 | 9.6 |
| 2000–2499 g | 9743 | 6029 (62%) | 19 | 3.2 |
| ≥2500 g | 15978 | 9313 (58%) | 18 | 1.9 |
| All birth weights | 32777 | 19326 (59%) | 116 | 6.0 |