Table 1. Mean and standard deviation of demographic data, psychiatric symptoms, reaction time in milliseconds, and artefact-free trials.

	DAT1		DRD4
	9R	10/10R	no 7R	7R
n (female)	62 (31)	98 (59)	114 (66)	46 (24)
Age	27.34 (7.56)	26.82 (7.14)	27.11 (7.64)	26.80 (6.40)
Symptoms of depression	3.29 (3.41)	4.36 (3.93)	3.93 (3.92)	3.98 (3.36)
ADHD symptoms	24.93 ( 8.22 )*	21.62 ( 7.17 )*	22.75 (7.54)	23.23 (8.30)
Reaction time	448.57 (62.81)	460.50 (52.38)	455.21 (60.63)	457.54 (46.35)
Number of errors	59.48 (38.12)	52.53 (30.78)	55.15 (34.66)	55.41 (32.18)
Artefact-free trials correct	261.21 (66.25)	260.54 (41.50)	260.89 (53.78)	260.57 (48.98)
Artefact-free trials incorrect	55.42 (36.26)	49.94 (30.79)	51.41 (33.80)	53.67 (31.26)

Standard deviations are shown in parentheses; significant differences are marked with *.