Demographic and clinical characteristic of enrolled infants (n=19)
| Birth weight (g) | 800 (678–1068) |
| Gestational age at birth (weeks) | 27 (25–28) |
| Boys | 9 (47) |
| Body weight* (g) | 986 (722–1168) |
| Postmenstrual age* (weeks) | 30 (29–31) |
| FiO2* | 0.21 (0.21–0.26) |
| Haematocrit* (%) | 36 (32–40) |
| Days on caffeine* | 20 (13–29) |
| Milk intake* (mL/kg) | 96 (68–137) |
Data are expressed as median (IQR) and number (%) .
*At time of study.