Days in hospital up to age 5 by multiplicity of birth and relative rates accounting for duration of life
| Total number | No readmitted | Mean (95% CI) | Median (IQR) | Relative rate | 95% CI | |
|---|---|---|---|---|---|---|
| IQR, Interquartile range; CI, confidence interval. | ||||||
| Singletons | 270428 | 126623 (47%) | 7.1 (7.0 to 7.1) | 5 (4–7) | 1.00 | |
| Twins | 6284 | 3137 (50%) | 14.7 (14.2 to 15.3) | 8 (6–15) | 2.40 | 2.35 to 2.46 |
| Higher order multiple births | 185 | 92 (50%) | 30.2 (25.6 to 34.8) | 20 (9–39) | 7.58 | 6.60 to 8.69 |