Table 1.

Demographic and Substance Use Patterns Between Those Who Co-Use and Do Not Co-Use Participants

	NO	CO
	n=61	n=14
	% or M (SD)	% or M (SD)
	Range	Range
Age	21.11 (2.64)	21.71 (1.98)
	16–25	18–26
Education	14.34 (2.28)	14.50 (1.65)
	9–21	11–18
Gender (% female)	47	43
Race (% Caucasian)	69	64
Ethnicity (% Hispanic)	10	14
Alcohol***	10.75 (14.52)	56.50 (36.11)
	0–64.84	15.48–132.58
Binge***	.76 (1.48)	5.81 (4.03)
	0–6.77	.97–11.61
Cannabis***	1.24 (3.73)	12.59 (14.26)
	0–20.56	.08–47.42
Co-use***	0 (0)	2.35 (1.81)
	0–0	.97–5.81
# Drinking days in past month**	3.88 (4.68)	8.64 (3.95)
	0–20	2–14
# Cannabis use days in past month***	2.73 (7.60)	14.36 (12.46)
	0–31	1–30
Age of regular alcohol use onset*,a	19.69 (1.76)	18.31 (1.44)
	16–25	16–21
Age of regular CAN use onseta	17.43 (1.76)	17.77 (1.64)
	13–21	15–20

^*p<0.05, ^**p<0.01,^***p<0.001.

^aAs not all participants have regularly (weekly) used either cannabis or alcohol, age of onset for regular cannabis NO has n=20, age of regular alcohol in NO has n=35. For CO group, n=13 for either variable; data were missing for one participant.

Demographic and substance use information by those who do (CO) and do not (NO) co-use cannabis and binge drinking. These groups were not use in any analyses, but to better approximate patterns of use and to establish appropriate covariates. Substance use information is from the past month and is presented in standardized units. Alcohol: standard drinks (1 ounce of liquor, 4 ounces of wine, 12 ounces of beer). Binge: occasions when individuals drank >4 drinks for females and >5 drinks for males. Cannabis: grams. Co-use: co-occurring binge and cannabis, days of co-use.

M, mean; SD, standard deviation; CO, co-users; NO, non-co-users; CAN, cannabis.