Table 2.

Association of COMT and AX-CPT Indices

	Omission errors				Commission errors				d′				lnβ
Predictor	Wald χ2	df	p	R2	Wald χ2	df	p	R2	Wald χ2	df	p	R2	Wald χ2	df	p	R2
Ethnicitya	4.76	1	.029	1%	2.43	1	.119	0%	2.80	1	.094	1%	1.06	1	.302	0%
Sex	1.28	1	.258	0%	7.93	1	.005	2%	5.39	1	.020	1%	3.90	1	.048	1%
Age	130.13	1	<.001	34%	94.61	1	<.001	25%	81.59	1	<.001	21%	0.04	1	.847	0%
Age2	4.61	1	.032	1%	1.00	1	.318	0%	31.52	1	<.001	8%	0.18	1	.675	0%
Clinical status	14.08	1	<.001	4%	27.57	1	<.001	7%	13.05	1	<.001	3%	<0.01	1	.954	0%
COMTb	2.58	2	.275	1%	4.60	2	.100	1%	3.11	2	.212	1%	1.55	2	.461	0%
COMT val/val vs. val/met & met/met combinedb	1.89	1	.169	0%	4.32	1	.038	1%	3.10	1	.078	1%	0.02	1	.900	0%
COMT val/met vs. met/metb	1.02	1	.313	0%	0.18	1	.670	0%	0.02	1	.886	0%	1.13	1	.288	0%
COMTc	2.83	2	.243	1%	3.78	2	.151	1%	2.95	2	.229	1%	1.62	2	.444	0%
COMT val/val vs. val/met & met/met combinedc	1.34	1	.247	0%	3.15	1	.076	1%	2.92	1	.088	1%	0.02	1	.897	0%
COMT val/met vs. met/metc	1.67	1	.196	0%	0.25	1	.618	0%	0.08	1	.783	0%	1.13	1	.287	0%
COMT × Clinical status	0.58	2	.747	0%	4.69	2	.096	1%	3.69	2	.158	1%	1.91	2	.384	1%

Note.

^aPercentage of European-American ethnicity;

^bClinical status not included in model;

^cClinical status included in model