Population characteristics collected as part of the investigation
| Trent 1994 & 1995 | Denmark 1994 & 1995 | |
|---|---|---|
| CI, confidence interval. | ||
| Liveborn infant < 28 and ≥ 21 weeks or < 1000g | 572 | 461 |
| Liveborn infant < 28 and ≥ 21 weeks or < 1000g per 1000 livebirths (95% CI) | 4.88 (4.50 to 5.29) | 3.31 (3.02 to 3.63) |
| Liveborn infant < 28 and ≥ 21 weeks or < 1000g admitted to a neonatal unit | 489 | 420 |
| Liveborn infant < 28 and ≥ 21 weeks or < 1000g admitted to a neonatal unit per 1000 livebirths (95% CI) | 4.17 (3.82 to 4.56) | 3.01 (2.74 to 3.31) |