Table 5.
Cross-Validated Percentages of Cases Correctly Classified as ADHD-C Versus Control
| Significant Predictors | Standardized Canonical Coefficients | ADHD-C (n = 74/65)a | Control (n = 26/24)a | Overall Correct Classificationb | |
|---|---|---|---|---|---|
| a. | WISC-IV WMI | 0.526 | 77.0% | 84.6% | 79.0% |
| TOF Attention Problems for WISC-IV | −0.490 | ||||
| WISC-IV VCI | 0.395 | ||||
| WISC-IV PSI | 0.340 | ||||
| b. | TOF ADHP Hyperactivity-Impulsivity for WISC-IV | −0.519 | 78.4% | 84.6% | 80.0% |
| WISC-IV WMI | 0.491 | ||||
| WISC-IV VCI | 0.446 | ||||
| WISC-IV PSI | 0.338 | ||||
| c. | WISC-IV WMI | 0.504 | 79.7% | 80.8% | 80.0% |
| TOF ADHP total score for WISC-IV | −0.487 | ||||
| WISC-IV VCI | 0.417 | ||||
| WISC-IV PSI | 0.332 | ||||
| d. | WIAT-II RC | 0.485 | 80.9% | 91.7% | 83.7% |
| TOF Attention Problems for WIAT-II | −0.456 | ||||
| WIAT-II MC | 0.443 | ||||
| e. | TOF ADHP Hyperactivity-Impulsivity for WIAT-II | −0.541 | 82.4% | 91.7% | 84.8% |
| WIAT-II RC | 0.469 | ||||
| WIAT-II MC | 0.435 | ||||
| f. | TOF ADHP total score for WIAT-II | −0.513 | 79.4% | 95.8% | 83.7% |
| WIAT-II RC | 0.454 | ||||
| WIAT-II MC | 0.421 | ||||
Note. All discriminant functions were significant at p < .001. ADHD-C = attention deficit hyperactivity disorder—combined type; Control = controls; ADHP = Attention Deficit/Hyperactivity Problems; TOF = Test Observation Form; WIAT-II = Wechsler Individual Achievement Tests-Second Edition; WISC-IV = Wechsler Intelligence Scale for Children—Fourth Edition; WMI = Working Memory Index; VCI = Verbal Comprehension Index; PSI = Processing Speed Index; RC = Reading Composite; MC = Mathematics Composite.
a
n for TOF and WISC-IV/n for TOF and WIAT-II.
b
Percentage of cross-validated grouped cases correctly classified.