Table 2

Results from the regression analyses of the effects of the risk factors on ADHD symptom count and response inhibition task performance

	ADHD symptom count		Stop-signal reaction time		Errors		Reaction time variability

Risk factor	Regression coefficient ± SE	p value	Regression coefficient ± SE	p value	Regression coefficient ± SE	p value	Regression coefficient ± SE	p value
Prenatal exposure to smoking	1.27 ± 0.78	0.10	2.28 ± 1.04	0.030	5.53 ± 9.48	0.56	21.51 ± 6.31	< 0.001^*
Prenatal exposure to alcohol	0.31 ± 0.83	0.71	−3.58 ± 10.02	0.72	1.40 ± 1.12	0.21	−0.62 ± 6.86	0.93
DRD4 7R	−0.73 ± 0.66	0.27	−7.05 ± 8.00	0.38	0.37 ± 0.90	0.68	−2.68 ± 5.48	0.63
DAT1 10/6	0.42 ± 0.63	0.51	8.23 ± 7.49	0.27	−0.40 ± 0.86	0.64	3.08 ± 5.20	0.55
DRD4 × exposure to smoking	−0.09 ± 1.53	0.95	13.50 ± 18.43	0.46	0.92 ± 2.09	0.66	0.66 ± 12.50	0.96
DRD4 × exposure to alcohol	−0.11 ± 1.81	0.95	23.56 ± 21.75	0.28	2.24 ± 2.46	0.36	−20.65 ± 14.95	0.17
DAT1 × exposure to smoking	−0.65 ± 1.49	0.66	8.27 ± 17.84	0.64	−0.19 ± 2.04	0.93	28.76 ± 12.00	0.020
DAT1 × exposure to alcohol	−0.65 ± 1.59	0.68	−40.64 ± 18.65	0.030	−5.12 ± 2.16	0.020	−3.51 ± 13.22	0.79
ADHD symptom count	—	—	1.72 ± 0.77	0.030	0.39 ± 0.09	< 0.001^*	2.72 ± 0.51	< 0.001^*