Table 1.

Demographics and Performance in the DRD2 rs1076560 Genotype Groups

	GG	GT	Difference
N	18	10
Age (y)	24.3 ± 3.1	22.8 ± 3.2	df = 26, t = 1.24, P = .23
Gender Ratio (M:F)	10:8	4:6	df = 1, P = .43
Hollingshead	41.9 ± 16.9	36.6 ± 11.6	df = 26, t = 0.89, P = .38
Wechsler Adult Intelligence Scalea (mean ± SEM)	113.1 ± 3.47	103.8 ± 6.38	df = 24, t = 1.38, P = .18
2-Back accuracy (% correct, mean ± SEM)	81.5 ± 3.37	88.2 ± 4.88	df = 26, t = 1.15, P = .26
2-Back Reaction Time (ms, mean ± SEM)	512.5 ± 51.65	562.1 ± 91.61	df = 26, t = 0.512, P = .63

^aAvailable for 24 subjects.