Study characteristics
| Median (IQR) | |
|---|---|
| Number of participants enrolled | 59 (40–138) |
| Number (%) | |
| Median birth weight <1000 g* | 21 (47.7) |
| Single centre | 37 (84.1) |
| Region | |
| International | 1 (2.3) |
| USA | 10 (22.7) |
| Canada | 3 (6.8) |
| Central/South America | 2 (4.6) |
| Europe | 12 (27.3) |
| UK | 8 (18.2) |
| Australia/New Zealand | 4 (9.1) |
| Asia | 3 (6.8) |
| Africa | 1 (2.3) |
| Study design | |
| Clinical trial | 22 (50) |
| Prospective observational | 12 (27.3) |
| Retrospective | 10 (22.7) |
*Estimated by calculating a weighted average of subgroups.