Centre-specific OR and 95% CI of survival among infants in three different gestational age groups in Switzerland over a 10-year period (2000–2009) standardised for gestational age, birth weight, single/multiple birth and sex; infants with lethal/severe malformations were excluded.
| Centre | N | Gestational age group (completed weeks) | ||
|---|---|---|---|---|
| 23–25 OR (95% CI) | 26–28 OR (95% CI) | 29–31 OR (95% CI) | ||
| (n=976) | (n=1943) | (n=3399) | ||
| 1 | 765 | 1.49 (0.99 to 2.25) | 0.85 (0.57 to 1.25) | 0.61 (0.35 to 1.09) |
| 2 | 830 | 0.56 (0.33 to 0.94)* | 0.78 (0.55 to 1.15) | 0.98 (0.52 to1.87) |
| 3 | 1047 | 1.39 (0.95 to 2.03) | 1.86 (1.23 to 2.81)† | 1.86 (0.89 to 3.88) |
| 4 | 566 | 2.57 (1.50 to 4.42)† | 2.51 (1.36 to 4.65)† | 1.66 (0.67 to 4.14) |
| 5 | 466 | 0.47 (0.23 to 0.95)* | 0.82 (0.51 to 1.34) | 1.68 (0.61 to 4.64) |
| 6 | 656 | 2.73 (1.72 to 4.34)† | 4.26 (1.96 to 9.23)† | 1.53 (0.67 to 3.54) |
| 7 | 1301 | 0.24 (0.15 to 0.36)* | 0.34 (0.26 to 0.46)* | 0.61 (0.37 to 0.98)* |
| 8 | 497 | 1.91 (1.13 to 3.24)† | 2.20 (1.13 to 4.29)† | 0.86 (0.39 to 1.88) |
| 9 | 190 | 0.49 (0.19 to 1.28) | 1.12 (0.43 to 2.90) | 0.91 (0.28 to 2.95) |