Table 5.

Japanese WISC IV comparison with United States.

	Japanese WISC IV comparison with United States
	Test-retest stability		Correlations between WISC-IV and III
	Japanese	United States	Japanese	United States
Full-Scale IQ	0.93	0.93	0.86	0.89
Subscale index
Verbal comprehension index	0.91	0.93	0.87	0.87
Perceptual reasoning index	0.78	0.89	0.65	0.74
Working memory index	0.82	0.89	0.7	0.72
Processing speed index	0.84	0.86	0.81	0.81
Subtest
Similarities	0.85	0.86	0.75	0.76
Vocabulary	0.8	0.92	0.72	0.82
Comprehension	0.74	0.82	0.71	0.62
Block design	0.81	0.82	0.75	0.77
Picture concepts	0.63	0.76	N/A	N/A
Matrix reasoning	0.64	0.85	N/A	N/A
Digit span	0.87	0.83	0.75	0.77
Letter-number sequencing	0.67	0.83	N/A	N/A
Coding	0.84	0.84	0.79	0.76
Symbol search	0.74	0.8	0.69	0.67

Note: IQ, Intelligence quotient; WISC, Wechsler Intelligence Scale for Children.