Table 1.
Demographic, neonatal characteristics and behavioural data by group.
| Mean and SD | VPT group (n = 20) | Control group (n = 19) | Mean difference | 95% confidence interval of the difference | Test statistic | p value |
|---|---|---|---|---|---|---|
| Age at assessment in years | 20.2 years ± 0.7 | 19.8 ± 1.8 | 0.38 | −1.27 to 0.51 | t(37) = −0.9 | p = 0.39 |
| Gender (m:f) | 14:6 | 8:11 | – | – | p = 0.08 | |
| Gestation in weeks | 28.1 ± 1.7 | – | – | – | – | |
| Birth weight in grams | 1212 ± 259.3 | – | – | – | – | |
| Full scale IQ | 96.7 ± 11.23 | 104.86 ± 14.01 | 8.16 | −0.67 to 16.98 | t(32) = 1.9 | p = 0.07 |
| Verbal IQ | 93.65 ± 13.01 | 101.86 ± 13.75 | 8.21 | −1.24 to 17.66 | t(32) = 1.8 | p = 0.09 |
| Performance IQ | 100.5 ± 10.73 | 106.71 ± 14.24 | 6.21 | −2.5 to 14.93 | t(32) = 1.5 | p = 0.16 |
| Mean response time | 0.48 ± 0.13 | 0.48 ± 0.13 | 0.01 | −0.1 to 0.08 | t(34) = −0.15 | p = 0.88 |
| ICV of response time | 0.63 ± 0.14 | 0.62 ± 0.08 | 0.01 | −0.09 to 0.07 | t(34) = −0.24 | p = 0.82 |
| Non-responses (median, range) | 0 (0–14) | 0 (0–22) | – | – | U = 174 | p = 0.57 |