A solution to limitations of cognitive testing in children with intellectual disabilities: the case of fragile X syndrome

Table 5 Intellectual ability classifications¹ (% of participants) determined by full scale IQ (FSIQ) versus mean normalized score

^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.

ISSN: 1866-1955