Table 1.

Subject demographics for different genotype groups

	Met/Met (N = 57)		Val/Met (N = 156)		Val/Val (N = 95)		p value
	Mean	SD	Mean	SD	Mean	SD
Male/female	28/29		71/85		50/45		0.545a
Age	22.35	2.50	22.67	2.41	22.97	2.70	0.333b
Education	15.11	3.18	15.48	2.71	15.86	2.04	0.256b
IQ	114.88	11.77	116.60	8.41	115.75	10.18	0.531b
Working memory
2-back_CR	89.13	5.21	88.48	6.02	87.86	8.51	0.567b
3-back_CR	82.30	4.49	81.18	6.89	81.26	9.62	0.689b
WCST
CC	4.98	1.71	4.99	1.74	4.96	1.74	0.997b
RC	70.96	13.33	70.60	11.17	70.24	11.74	0.973b
PRC	68.97	15.88	68.73	14.10	69.17	15.12	0.909b

CR, Correction rate; WCST, Wisconsin Card Sorting Test; CC, categories completed; RC, total correct responses; PRC, percent correct responses.

^ap value (Pearson χ² test).

^bp value (ANOVA).