Table 1.

Mean chronological ages (years: months) and mean WISC IQ scores of the participants.

	Group		Significance of difference (P)
	Experimental (N = 9)	Control (N = 7)
Age	9:7 (1:0)	9:6 (1:5)	0.28
WISC III
Verbal IQ	106.2 (16.2)	108.6 (20.7)	0.26
Performance IQ	100.3 (17.7)	105.1 (12.6)	0.14
Full-scale IQ	103.9 (17.7)	107.6 (17.2)	0.92

Standard deviations presented in parentheses. Probabilities were evaluated by t-tests (df = 14).