Table 1 Characteristics of the babies in the study at birth and during the neonatal and follow up period until to 2 years of age.
| All subjects (n = 262) | Girls (n = 140) | Boys (n = 122) | |
|---|---|---|---|
| Observations per subject | 45 (44) (28–78) | 45 (44) (28–76) | 45 (44) (31–78) |
| Length of follow up (weeks) | 135 (117) (54–312) | 136 (117) (54–223) | 135 (117) (59–312) |
| Birth weight (g) | 1140 (1175) (540–1495) | 1120 (1140) (540–1490) | 1163 (1200) (560–1495) |
| Birth weight (SDS) | −0.98 (−0.96) (−3.72–+1.39) | −0.99 (−1.08) (−3.46–+1.39) | −0.97 (−0.88) (−3.72–+1.04) |
| Gestational age (weeks) | 30.4 (30.4) (23.4–38.0) | 30.6 (30.7) (24.7–38.0) | 30.2 (29.9) (23.4–37.3) |
| SGA | 101 (38.5%) | 57 (40.7%) | 44 (36.1%) |
| Patent ductus arteriosus | 31 (11.8%) | 18 (12.9%) | 13 (10.7%) |
| Late sepsis | 30 (11.5%) | 17 (12.1%) | 13 (10.7%) |
| Bronchopulmonary dysplasia | 25 (9.5%) | 10 (7.1%) | 15 (12.3%) |
| Severe neurological sequelae at 2 years | 23 (8.8%) | 13 (9.3%) | 10 (8.2%) |
| One or more major morbidities | 77 (29.4%) | 40 (28.6%) | 37 (30.3%) |
| More than 7 days of mechanical ventilation | 35 (13.4%) | 18 (12.9%) | 17 (13.9%) |
| Age at full enteral feeding (days) | 12 (10) (0–59) | 12 (10) (0–59) | 12 (10) (0–49) |
| More than 14 days of parenteral nutrition | 73 (27.9%) | 42 (30.0%) | 31 (25.4%) |
| Age at discharge (days) | 55 (48) (23–171) | 54 (48) (23–148) | 56 (48) (24–171) |
Values are mean (median) (range) or number (%).
SGA, Small for gestational age.