. Author manuscript; available in PMC: 2022 Sep 1.

Published in final edited form as: Behav Genet. 2021 Jun 12;51(5):543–558. doi: 10.1007/s10519-021-10067-7

Table 1.

Descriptive statistics for externalizing indicators

	Time 1		Time 2
Indicators	Mean	SD	Mean	SD
Alcohol use	.23	.95	.92	1.84
Marijuana use	2.66	24.82	12.08	53.26
Cigarette use^a	3.2%	-	9.5%	-
Conduct disorder criterion count	.71	1.18	.66	1.20
Oppositional defiant disorder criterion count	.98	1.57	.89	1.52

Note. Abbreviations: SD = standard deviation.

For binary variable, proportion of response category = 1 were reported. Alcohol use was measured by asking individuals to report the frequency of past-year use on a 12-point scale. Non-drinkers were coded as zero. Marijuana use was assessed by asking participants to report the number of times they used marijuana in the last 12 months. Cigarette use was coded as 1 = past-year use, and 0 = no cigarette use in the past year.