Table 2.

Verbal Intelligence Estimates (WTAR Scaled Scores), and Data on Participant, Maternal, and Paternal Education Levels, by Group

		N	Mean (SD)	t (df)	Sig.	Effect Size (Cohen’s d)
WTAR	Control	37	114.73 (8.79)	4.75 (41.86)	0.00	1.27
	Schizophrenia	28	100.07 (14.41)
Years of education	Control	37	17.16 (2.02)	4.30 (63)	0.00	1.08
	Schizophrenia	28	14.73 (2.53)
Years of Education – Mother	Control	37	15.22 (2.97)	0.76 (60)	0.45	0.20
	Schizophrenia	25	14.60 (3.34)
Years of Education – Father	Control	37	15.35 (3.31)	0.30 (56)	0.77	0.08
	Schizophrenia	21	15.10 (2.76)

Note: Per convention d=0.20 is a small effect size, 0.50 is a medium effect size, and 0.80 or higher is considered a large effect size.