Table I.
Mean FSIQ, GAI, and GAC scores for the total sample, ‘both impaired’, and ‘discrepant’ groups
| Total sample (SD) | ‘Both impaired’ group (SD) | ‘Discrepant’ group (SD) | t | p | Cohen’s d | |
|---|---|---|---|---|---|---|
| n | 833 | 152 | 44 | – | – | – |
| Males/Females | 543/209 | 63.83 | 68.85 | – | – | – |
| Age (y) | 10.4 (2.74) | 11.42 (2.72) | 11.17 (2.85) | 0.518 | 0.605 | 0.09 |
| FSIQ | 84.08 (18.07) | 57.23 (7.59) | 67.00 (3.33) | −8.30 | <0.001 | −1.67 |
| GAI | 87.77 (19.14) | 57.88 (8.97) | 75.75 (3.54) | −12.91 | <0.001 | −2.62 |
| ABAS GAC | 74.63 (17.17) | 63.61 (14.82) | 70.32 (15.55) | −2.61 | 0.01 | −0.44 |
| ABAS conceptual | 77.87 (14.46) | 66.97 (13.61) | 72.75 (13.54) | −2.49 | 0.014 | −0.43 |
| ABAS social | 81.52 (17.45) | 72.55 (15.04) | 80.23 (16.0) | −2.94 | 0.004 | −0.50 |
| ABAS practical | 75.11 (19.11) | 63.95 (18.55) | 72.07 (19.36) | −2.53 | 0.012 | −0.43 |
t, p, and Cohen’s d values are for comparisons between the ‘both impaired’ and ‘discrepant’ groups only. FSIQ, WISC-IV Full Scale Intelligence Quotient; GAI, WISC-IV General Abilities Index; ABAS, Adaptive Behavior Assessment System; GAC, General Adaptive Composite.