Table 2.

WISC-IV Subtest and Index Scores in 146 Children with ADHD

Assessment	Mean (SD)	Standardized Scores (Mean)	P value*
Index
Verbal comprehension	88.36 ± 13.63	100 ± 15	P<0.001
Perceptual reasoning	102.60 ± 13.73	100 ± 15	P=0.031
Working memory	97.97 ± 11.89	100 ± 15	P=0.038
Processing speed	95.73 ± 13.59	100 ± 15	P<0.001
Full scale intelligent quotient	94.53 ± 12.52	100 ± 15	P<0.001
Subtest
Similarities	8.99 ± 2.94	10 ± 3	P<0.001
Vocabulary	6.39 ± 2.82	10 ± 3	P<0.001
Comprehension	8.24 ± 2.56	10 ± 3	P<0.001
Block design	10.94 ± 2.92	10 ± 3	P<0.001
Picture concepts	9.75 ± 2.73	10 ± 3	P=0.177
Matrix reasoning	10.68 ± 2.72	10 ± 3	P=0.006
Digit span	9.92 ± 2.36	10 ± 3	P=0.742
Letter-number sequencing	8.56 ± 2.36	10 ± 3	P<0.001
Coding	8.33 ± 3.09	10 ± 3	P<0.001
Symbol search	10.25 ± 2.69	10 ± 3	P=0.611

Notes: *One-sample Wilcoxon signed rank test.