Table 3.

Among students reporting no lifetime cigarette or nicotine vape use, multinomial logistic regression of past-year simultaneous alcohol and marijuana (SAM) use, alcohol-only, marijuana-only, and non-simultaneous alcohol and marijuana among 12th graders from 2000-2020

Covariate	Past-year SAM Vs. no use	Past-year alcohol-only Vs. no use	Past-year marijuana-only Vs. no use	Past-year alcohol and marijuana use but not simultaneously Vs. no use
	aOR [95% CI]	aOR [95% CI]	aOR [95% CI]	aOR [95% CI]
Survey year (ref=2000-2005)
2006-2009	1.11 [0.89, 1.37]	1.08 [0.94, 1.23]	1.46 [0.89, 2.40]	1.22 [0.96, 1.54]
2010-2014	1.48 [1.22, 1.80]	0.87 [0.78, 0.97]	2.58 [1.69, 3.94]	1.58 [1.29, 1.94]
2015-2020	1.40 [1.15, 1.71]	0.68 [0.61, 0.76]	5.43 [3.63, 8.12]	1.72 [1.40, 2.11]
Sex (ref=male)
Female	0.87 [0.78, 0.99]	1.18 [1.10, 1.26]	0.80 [0.63, 1.03]	1.05 [0.93, 1.18]
Parental education (ref=finished college or more)
Some high school or lower	0.81 [0.64, 1.02]	0.97 [0.84, 1.12]	1.20 [0.75, 1.92]	1.08 [0.84, 1.39]
Finished high school or some college	1.06 [0.93, 1.21]	1.05 [0.98, 1.14]	1.29 [0.97, 1.71]	1.16 [1.01, 1.33]
Race/ethnicity (ref=white)
Black	0.98 [0.80, 1.19]	0.75 [0.67, 0.85]	3.12 [2.17, 4.48]	1.27 [1.05, 1.53]
Other	0.89 [0.76, 1.04]	0.92 [0.85, 1.01]	1.80 [1.29, 2.53]	0.96 [0.81, 1.13]

Note: aOR=Adjusted odds ratio. Alcohol-only is defined as past-year alcohol use and no report of past-year marijuana or simultaneous use. Marijuana-only is defined as past-year marijuana use and no report of past-year alcohol or simultaneous use.

Model adjusts for survey year, sex, parental education, race/ethnicity, and also adjusted for survey mode (not shown)