Table 4

Subtests of the Wechsler Adult Intelligence Scale for patients and controls

Mean score Patients (n=126)Mean score Controls (n=36)*Difference p value
*Data from Uterwijk.13
Verbal Scale subtests:
    Information5.47 (SD 1.55)6.31 (SD 1.69) 0.006
    Comprehension5.47 (SD 1.99)6.94 (SD 1.71)<0.0001
    Arithmetic5.37 (SD 2.02)6.61 (SD 1.66) 0.001
    Similarities7.02 (SD 1.91)8.11 (SD 1.74) 0.002
    Digit span5.83 (SD 2.09)6.36 (SD 1.91) 0.15
    Vocabulary5.97 (SD 1.88)6.81 (SD 1.62) 0.01
Performance Scale subtests:
    Digit symbol6.10 (SD 2.20)7.31 (SD 1.64) 0.001
    Picture completion5.83 (SD 1.90)7.75 (SD 1.65)<0.0001
    Block design6.30 (SD 1.80)7.25 (SD 1.56) 0.003
    Picture arrangement6.64 (SD 2.05)7.28 (SD 1.81) 0.08
    Object assembly6.24 (SD 1.82)6.39 (SD 1.63) 0.64