Table 4.
Cross-Validated Percentages of Cases Correctly Classified as ADHD-C Versus NON-ADHD-REF
| Significant Predictors | Standardized Canonical Coefficients | ADHD-C (n = 74/65)a | NON-ADHD-REF (n = 52/49)a | Overall Correct Classificationb | |
|---|---|---|---|---|---|
| a. | TOF Attention Problems for WISC-IV | 1.095 | 71.6% | 78.8% | 74.6% |
| TOF Anxious for WISC-IV | −0.631 | ||||
| b. | TOF Attention Problems for WISC-IV | −0.867 | 64.9% | 73.1% | 68.3% |
| WISC-IV VCI | 0.482 | ||||
| TOF Anxious for WISC-IV | 0.472 | ||||
| c. | TOF ADHP Hyperactivity- Impulsivity for WISC-IV | 0.776 | 64.9% | 75.0% | 69.0% |
| WISC-IV VCI | −0.623 | ||||
| d. | TOF ADHP total score for WISC-IV | 0.750 | 63.5% | 76.9% | 69.0% |
| WISC-IV VCI | −0.598 | ||||
| e. | WIAT-II RC | 0.685 | 73.5% | 72.0% | 72.9% |
| TOF Oppositional for WIAT-II | −0.671 | ||||
| f. | TOF ADHP Hyperactivity- Impulsivity for WIAT-II | 0.772 | 72.1% | 72.0% | 72.0% |
| WIAT-II RC | −0.568 | ||||
| g. | TOF ADHP total score for WIAT-II | 0.734 | 66.2% | 70.0% | 67.8% |
| WIAT-II RC | −0.563 | ||||
Note. All discriminant functions were significant at p < .001. 1 ADHD-C = attention deficit hyperactivity disorder—combined type; NON-ADHD-REF = non-ADHD clinically referred; 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; VCI = Verbal Comprehension Index; RC = Reading Composite.
a
n for TOF and WISC-IV/n for TOF and WIAT-II.
b
Percentage of cross-validated grouped cases correctly classified.