Neonatal characteristics of the study group stratified by admitting hospital A to H
| Characteristic | A (n=1225) | B (n=1000) | C (n=963) | D (n=889) | E (n=856) | F (n=848) | G (n=785) | H (n=646) | All (n=7212) |
| Onsite surgical support | Yes | No | No | Yes | No | No | No | Yes | – |
| Born in non-tertiary hospital | 155 (12.7) | 89 (8.9) | 97 (10.1) | 94 (10.6) | 78 (9.1) | 99 (11.7) | 74 (9.4) | 61 (9.4) | 747 (10.4) |
| Male gender | 687 (56.1) | 531 (53.1) | 501 (52.0) | 481 (54.1) | 460 (53.7) | 478 (56.4) | 409 (52.1) | 345 (53.4) | 3892 (54.0) |
| Gestational age, week* | 29.0 (27.0–31.0) | 29.0 (27.0–30.0) | 29.0 (27.0–31.0) | 29.0 (27.0–30.0) | 29.0 (27.0–30.0) | 29.0 (27.0–30.0) | 29.0 (27.0–31.0) | 29.0 (27.0–31.0) | 30.0 (29.0–31.0) |
| Birth weight, g* | 1270 (960.0–1550.0) | 1200.0 (910.0–1494.0) | 1240.0 (938.0–1536.0) | 1235.0 (940.0–1547.0) | 12 250.0 (960.0–1520.0) | 1220.0 (930.0–1502.0) | 1260.0 (960.0–1559.0) | 1290.0 (980.0–1550.0) | 1240.0 (950.0–1530.0) |
| Birth weight<10th percentile | 82 (6.7) | 99 (10.0) | 72 (7.5) | 60 (6.8) | 72 (8.5) | 69 (8.2) | 57 (7.3) | 50 (7.8) | 561 (7.8) |
| Head circumference<10th percentile | 47 (3.9) | 26 (2.8) | 34 (4.0) | 47 (5.5) | 33 (4.1) | 31 (3.8) | 25 (3.4) | 22 (3.4) | 265 (3.9) |
| Apgar score<7 at 5 min | 213 (17.5) | 218 (21.9) | 211 (22.0) | 173 (19.5) | 191 (22.4) | 158 (18.7) | 140 (17.9) | 156 (24.2) | 1460 (20.3) |
| Surfactant | 642 (52.4) | 741 (74.1) | 509 (52.9) | 534 (60.1) | 572 (66.8) | 516 (60.8) | 580 (73.9) | 373 (57.7) | 4467 (61.9) |
| Postnatal steroids | 32 (2.6) | 66 (6.6) | 62 (6.4) | 82 (9.2) | 54 (6.3) | 69 (8.1) | 59 (7.5) | 44 (6.8) | 468 (6.5) |
Other than for onsite surgical support data are presented as median (IQR)* or n (%).