Table 6
Gestational age specific cerebral palsy (CP) prevalence rates in surviving co-twin of a fetal (group 1) or infant (group 2) death per 1000 infant survivors
| Survivor of a fetal death co-twin (group 1) | Survivor of a co-twin who died in infancy (group 2) | |||||||
|---|---|---|---|---|---|---|---|---|
| Gestational age (weeks) | No with CP | No of responders | CP rate (per 1000 survivors) | 95% CI | No with CP | No of responders | CP rate (per 1000 survivors) | 95% CI |
| Note: Gestational age specific cerebral palsy prevalence in singletons in the NE England Register (1985–1989) were: <32 weeks 62.1 (95% CI 39 to 93); ≥32 weeks 1.7 (95% CI 1.3 to 2.0) per 1000 neonatal survivors (P Drummond, personal communication). | ||||||||
| NA, Not applicable. | ||||||||
| Like-sex twins | ||||||||
| <32 | 1 | 9 | 111.1 | 3 to 482 | 13 | 43 | 302.3 | 172 to 461 |
| ≥32 | 7 | 61 | 114.8 | 47 to 222 | 3 | 61 | 49.2 | 10 to 137 |
| Total | 8 | 70 | 114.3 | 51 to 213 | 16 | 104 | 153.8 | 84 to 223 |
| Unlike-sex twins | ||||||||
| <32 | 1 | 2 | 500.0 | 13 to 987 | 2 | 11 | 181.8 | 23 to 519 |
| ≥32 | 0 | 20 | – | NA | 0 | 15 | – | NA |
| Total | 1 | 22 | 45.4 | 1 to 228 | 2 | 26 | 76.9 | 9 to 251 |
