Baseline characteristics of the final very preterm cohort with follow-up data and also those infants lost to follow-up
| Characteristics | Final cohort (n=75) | Lost to follow-up (n=19) | P value |
| Chorioamnionitis, n (%) | 10 (13.3) | 4 (21.1) | 0.47 |
| Antenatal steroids (completed course)*, n (%) | 40 (54.8) | 6 (33.3) | 0.12 |
| Gestational age, weeks, mean (SD) | 28.1 (2.4) | 28.8 (3.0) | 0.10 |
| Birth weight, grams, mean (SD) | 1116.9 (396.4) | 1140.8 (394.8) | 0.37 |
| Male, n (%) | 44 (58.7) | 9 (47.4) | 0.44 |
| Severe retinopathy of prematurity, n (%) | 8 (10.7) | 1 (5.3) | 0.68 |
| Bronchopulmonary dysplasia, n (%) | 39 (52.0) | 9 (47.4) | 0.80 |
| Late onset sepsis, n (%) | 8 (10.7) | 5 (26.3) | 0.13 |
| Postnatal steroids, n (%) | 6 (8.0) | 0 (0.0) | 0.34 |
| Low socioeconomic status, n (%) | 40 (53.3) | 15 (78.9) | 0.07 |
| Moderate injury on structural MRI, n (%)† | 11 (14.7) | 1 (5.3) | 0.44 |
*Antenatal steroid information was unavailable for two subjects in the final cohort and one subject lost to follow-up.
†Only one subject in our final cohort had severe injury on structural MRI.