Table 1.
Socio-demographic, neonatal, and anthropometric characteristics of the sample
| Very preterm | Controls | ||
|---|---|---|---|
| Number of subjects | 51 | 60 | |
| Males/females | 26/25 | 22/38 | χ2 (1) = 1.72, P = 0.19 |
| Age at assessment | 29.26 (2.13) | 28.88 (3.43) | t(109) = .67, P = NS |
| Birth weight (g) | 1284 (339) | n/a | |
| Gestational age (weeks) | 29.21 (2.25) | n/a | |
| Lateral ventricular volume (% of the intracranial volume)a | 1.05 (0.55–2.01) | 0.82 (0.49–1.29) | t(109) = 2.61, P < 0.01 |
| Socio-economic categories: | |||
| I | 17.6% | 28.3% | |
| II | 49.0% | 30.0% | |
| III | 15.7% | 8.3% | |
| IV | 0.0% | 1.7% | |
| V | 2.0% | 0.0% | |
| Students | 2.0% | 23.3% | |
| Unemployed/out of work | 13.7% | 6.7% | |
| Missing | 0.0% | 1.7% | |
| Neonatal US classification: | |||
| Normal | 26 | n/a | |
| Uncomplicated PVHb | 7 | n/a | |
| PVH + DIL | 17 | n/a | |
| Missing data | 1 | n/a | |
Note: SES categories of participants are in accordance with Standard Occupational Classification 1980 (SOC1980).
PVH, periventricular hemorrhage; PVH + DIL, periventricular hemorrhage with ventricular dilatation [see Materials and Methods and Nosarti et al. (2011)].
aStatistics were calculated for the log-transformed data. Mean and confidence intervals (1 SD) were obtained after transforming back to the original scale.
bDue to a small number of participants in this group, no post hoc analyses were performed.