Table 1.
Clinical characteristics
| VLBW (n = 35) | Control (n = 37) | |||
|---|---|---|---|---|
| Mean | (SD) | Mean | (SD) | |
| Birth weight (g) | 1198 | (254) | 3608 | (361) |
| Gestational age (weeks) | 29.0 | (2.7) | 39.4 | (1.1) |
| Birth head circumference (cm)a | 26.9 | (2.4) | 35.2 | (1.2) |
| Apgar score after 1 minb | 6.8 | (1.9) | 8.9 | (0.5) |
| Apgar score after 5 minc | 8.4 | (1.7) | 9.7 | (1.5) |
| Maternal age at birth (years) | 28.4 | (5.6) | 30.1 | (4.5) |
| Parental SES (at 14 years)c | 3.5 | (1.1) | 3.7 | (1.1) |
| Age at current follow-up | 22.5 | (0.7) | 22.7 | (0.6) |
| Median | (Range) | Median | (Range) | |
| Stay in NICU (days)d | 63 | (25–386) | 0 | (0–9) |
| Mechanical ventilation (days)d | 1 | (0–63) | - | |
| n | (%) | n | (%) | |
| Intraventricular haemorrhaged | 3 | (9) | - | |
| Grade I-II | 2 | |||
| Grade IV | 1 | |||
| Cerebral palsy | 4 | (11) | 0 | |
| GMFCS level I-II | 3 | |||
| GMFCS level IV | 1 | |||
| Low IQest | 8 | (23)e | 1 | (3) |
aData missing for eight VLBW and three control participants
bData missing for three control participants
cData missing for two control participants
dData missing for one VLBW participant
eTwo VLBW participants with low IQest had cerebral palsy
VLBW = very low birth weight, SES = socioeconomic status, NICU = neonatal intensive care unit, GMFCS = Gross Motor Function Classification System, IQ est = estimated intelligence quotient
Group differences for maternal age, SES and age at follow-up were non-significant