Table 5.
Intellectual ability classifications1 (% of participants) determined by full scale IQ (FSIQ) versus mean normalized score
| Classificationa | Males | Females | ||
|---|---|---|---|---|
| Based on FSIQ (%) | Based on mean normalized (%) | Based on FSIQ (%) | Based on mean normalized (%) | |
| Profound | 0.0 | 3.3 | 0.0 | 0.0 |
| Severe | 0.0 | 17.0 | 0.0 | 2.2 |
| Moderate | 84.8 | 46.4 | 20.8 | 8.7 |
| Mild | 10.8 | 29.4 | 29.2 | 16.3 |
| Borderline | 3.8 | 1.3 | 15.6 | 26.1 |
| Low average | 0.6 | 2.6 | 10.4 | 21.7 |
| Average | 0.0 | 0.0 | 20.8 | 22.8 |
| High average | 0.0 | 0.0 | 3.1 | 2.2 |
aClassifications: profound, FSIQ < 25 or mean z < −5.0; Severe, FSIQ ≥ 25 and < 40 or mean z ≥ −5.0 and < −4.0; Moderate, FSIQ ≥ 40 and < 55 or mean z ≥ −4.0 and < −3.0; Mild, FSIQ ≥ 55 and < 70 or mean z ≥ −3.0 and < −2.0; Borderline, FSIQ ≥ 70 and < 80 or mean z ≥ −2.0 and < −1.3; Low Average, FSIQ ≥ 80 and < 90 or mean z ≥ −1.3 and < −0.7; Average, FSIQ ≥ 90 and < 110 or mean z ≥ −0.7 and < 0.7; High Average, FSIQ ≥ 110 and < 120 or mean z ≥ 0.7 and < 1.3. z score refers to the number of standard deviations from the average of the WISC-III normative sample.