Network | ANZNN | CNN | INN | NRNJ | SNQ | SwissNeo Net | SEN1500 | UKNC* | FinMBR | TuscanNN | Total |
---|---|---|---|---|---|---|---|---|---|---|---|
Study infants (240–276 weeks), n | 7114 | 7019 | 2889 | 10 244 | 1745 | 1421 | 5440 | 10 996 | 847 | 372 | 48 087 |
Surviving to 32 weeks PMA (%) | 5969 (83.9) | 5806 (82.7) | 1998 (69.2) | 9360 (91.8) | 1506 (86.3) | 1129 (79.5) | 3686 (67.8) | 8920 (81.2) | 712 (86.7) | 270 (72.6) | 39 356 (81.8) |
Screened for ROP (% of survivors) | 5773 (96.7) | 5142 (88.6) | 1989 (99.6) | 9019 (96.4) | 1474 (97.9) | 1107 (98.1) | 3425 (92.9) | 8792 (98.5) | 664 (91.1) | 268 (99.3) | 37 653 (95.0) |
GA† (weeks %) | |||||||||||
24 | 13.1 | 12.6 | 8.3 | 18.1 | 13.4 | 9.6 | 8.5 | 14.5 | 14.8 | 17.9 | 13.9 |
25 | 21.8 | 24.5 | 19.1 | 22.3 | 22.1 | 18.8 | 19.3 | 20.1 | 20.9 | 20.9 | 21.4 |
26 | 30.4 | 29.1 | 32.8 | 27.6 | 29.2 | 34.2 | 31.7 | 29.0 | 26.1 | 21.6 | 29.4 |
27 | 34.7 | 33.8 | 39.9 | 32.0 | 35.4 | 37.4 | 40.5 | 36.4 | 38.3 | 39.6 | 35.3 |
Birth weight†<1000 g (%) | 4229 (73.3) | 3832 (74.5) | 1490 (74.9) | 7541 (83.6) | 1095 (74.3) | 880 (79.5) | 2471 (72.2) | 6569 (74.7) | 485 (73.0) | 204 (76.1) | 28 796 (76.5) |
Retinopathy treatment, n (% of screened) | 424 (7.3) | 537 (10.4) | 210 (10.7) | 2740 (30.4) | 157 (10.7) | 47 (4.3) | 456 (13.3) | 743 (8.5) | 78 (11.8) | 27 (10.1) | 5419 (24.9) |
Death or ROP treatment (% of study infants) | 1569 (22.1) | 1750 (24.9) | 1101 (38.1) | 3582 (35.0) | 396 (22.7) | 339 (23.9) | 2210 (40.6) | 2819 (25.6) | 213 (25.2) | 129 (34.7) | 14 108 (29.3) |
*UKNC excluded infants who died <37 weeks PMA.
†Among infants surviving to 32 weeks PMA.
ANZNN, Australia and New Zealand Neonatal Network; CNN, Canadian Neonatal Network; FinMBR, Finnish Maternal Birth Register; GA, gestational age; iNeo, International Network for Evaluating Outcomes; INN, Israel Neonatal Network; NRNJ, Neonatal Research Network of Japan; PMA, postmenstrual age; ROP, retinopathy of prematurity; SEN1500, Spanish Neonatal Network; SNQ, Swedish Neonatal Quality Register; SwissNeoNet, Swiss Neonatal Network; TuscanNN, Tuscan Neonatal Network; UKNC, UK Neonatal Collaborative.