Current and neonatal demographic factors
| Demographic variables | PBI | VPT-N | Controls | Test statistic | Significance |
|---|---|---|---|---|---|
| Mean age in years (SD)* | 29.94 (1.31) | 30.23 (2.19) | 29.94 (3.18) | χ2 = 0.856 | p = 0.652 |
| Gender (female:male)* | 10:10 | 10:11 | 29:16 | χ2 = 2.146 | p = 0.342 |
| Mean gestational age in weeks (SD)∧ | 28.45 (2.52) | 30.26 (1.9) | W = 109.5 | p = 0.023 | |
| Birth weight in grams (SD)∧ | 1203 (349) | 1502 (297) | t = 2.879 | p = 0.006 | |
| Full scale IQ (SD)* | 105.87 (16.94) | 108.82 (11.77) | 115.94 (10.44) | F = 3.103 | p = 0.052 |
| Verbal IQ (SD)* | 109.73 (9.6) | 105.65 (13) | 112.5 (13.71) | F = 1.625 | p = 0.205 |
| Performance IQ (SD)* | 98.56 (21.1) | 110.24 (12.11) | 115.94 (10.44) | F = 8.045 | p = 0.001 |