Characteristics of study infants (those infants excluded because of missing data are compared with those with complete data)
| Complete data | n= | Missing data | n= | p value | |
|---|---|---|---|---|---|
| Male:female | 1:1 | 297 | 1:1.1 | 85 | 0.741-150 |
| Median gestation (range) | 29 (24–37) | 297 | 31 (24–38) | 85 | <0.001‡ |
| Median birth weight (range) | 1170 (560–1500) | 297 | 1340 (770–1500) | 85 | <0.001‡ |
| Median 5 minute Apgar score (range) | 9 (0–10) | 297 | 9 (3–10) | 85 | <0.001‡ |
| Median day 3 CRIB score, CRIB72 (range) | 2 (0–17) | 297 | 1 (1–5) | 64 | <0.001‡ |
| Number of infants with grade III or IV IVH on day 3 | 27 (9%) | 297 | 1 (7%) | 14 | 0.54** |
| Died | 43 (14%) | 297 | 6 (7%) | 85 | 0.10** |
| Severe disability at 2 years in survivors1-151 | 14 (5%) | 283 | 1 (1%) | 77 | 0.21** |