Birthweight specific cerebral palsy (CP) prevalence in twin infant survivors of a co-twin fetal or infant death
| Birthweight group | No of infant survivors | No of responders (response rate) | No with CP | CP prevalence/1000 |
|---|---|---|---|---|
| Values in parentheses are percentages. Like-sex compared with unlike-sex Mantel-Haenszel weighted relative risk 2.55 (95% CI 1.23 to 5.27); p=0.01. | ||||
| Like sex | ||||
| Not stated | 17 | 8 (47) | 0 | – |
| <1000 g | 89 | 71 (80) | 15 | 211.2 |
| 1000–1499 g | 134 | 100 (75) | 21 | 210.0 |
| 1500–1999 g | 86 | 51 (51) | 7 | 137.3 |
| 2000–2499 g | 100 | 81 (65) | 4 | 49.4 |
| ≥2500 g | 130 | 84 (65) | 1 | 11.9 |
| All birth weights | 556 | 395 (71) | 48 | 121.5 |
| Unlike sex | ||||
| Not stated | 10 | 5 (50) | 0 | – |
| <1000 g | 46 | 35 (76) | 6 | 171.4 |
| 1000–1499 g | 41 | 36 (88) | 1 | 27.8 |
| 1500–1999 g | 28 | 21 (75) | 1 | 47.6 |
| 2000–2499 g | 47 | 26 (55) | 0 | – |
| ≥2500 g | 71 | 54 (76) | 0 | – |
| All birth weights | 243 | 177 (73) | 8 | 45.2 |