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| Characteristic | No. (%) of Participants |
|---|---|
| Sex | |
| Female | 25 026 (47.8) |
| Male | 26 443 (50.6) |
| Other/unknown | 880 (1.7) |
| Birth weight | |
| Normal (>2500 g) | 46 174 (88.3) |
| Low (2499-1501 g) | 4447 (8.5) |
| Very low (1500-1000 g) | 888 (1.7) |
| Extremely low (<1000 g) | 840 (1.6) |
| Age at DBS collection, h | |
| <24 | 832 (1.6) |
| 24-48 | 43 400 (83.0) |
| 49-72 | 3111 (5.9) |
| 73-96 | 388 (0.7) |
| 97-168 | 505 (1.0) |
| >168 | 4112 (7.9) |
Abbreviation: DBS, dried blood spot.
