. Author manuscript; available in PMC: 2017 Sep 1.

Published in final edited form as: Addiction. 2016 Jun 8;111(9):1582–1589. doi: 10.1111/add.13398

Table 1.

Comparison of ADHD and NonADHD participants in the current sample

	ADHD (n = 170)	NonADHD (n = 119)

	Mean (SD)	Mean (SD)	t-test
Continuous Variables
Current Age	29.02 (3.39)	28.15 (3.32)	2.15^*
Highest Parental Education	7.11(1.62)	7.49 (1.65)	−1.89^*

	Percentage (n)	Percentage (n)	Chi-Square

Dichotomous Variables
Gender (Male)	88.7 (152)	89.7 (107)	.08
Race (White)	81.18 (138)	81.51 (97)	.01
Childhood Conduct Disorder Diagnosis	29.22 (45)	0 (0)	41.64^***

Note:

p < .05,

^**

p < .01,

^***

p < .001.

Highest parental education was measured during the initial PALS interview (1999–2003) using a 1 (elementary school) to 9 (graduate school) scale.