Table 3.

Multinomial logistic regressions of past-year alcohol and/or cannabis use by sex

		Past-year simultaneous use Vs. no use	Past-year alcohol-use-only Vs. no use	Past-year cannabis-use-only Vs. no use	Past-year alcohol and cannabis use but not simultaneously Vs. no use
Subgroup	Survey year (ref=2000–2004)	aRRR [95% CI]	aRRR [95% CI]	aRRR [95% CI]	aRRR [95% CI]
Male (N= 17,771)	2005–2009	0.78 [0.66, 0.93]	0.89 [0.76, 1.03]	0.96 [0.59, 1.55]	0.96 [0.79, 1.16]
	2010–2014	0.78 [0.66, 0.94]	0.66 [0.58, 0.76]	1.51 [0.98, 2.34]	0.91 [0.75, 1.10]
	2015–2020	0.48 [0.40, 0.58]	0.48 [0.42, 0.56]	2.15 [1.43, 3.21]	0.73 [0.60, 0.89]
Female (N= 20,028)	2005–2009	0.86 [0.73, 1.02]	0.95 [0.83, 1.09]	1.10 [0.68, 1.77]	0.85 [0.71, 1.03]
	2010–2014	0.77 [0.65, 0.90]	0.73 [0.64, 0.83]	1.28 [0.80, 2.06]	0.87 [0.73, 1.05]
	2015–2020	0.67 [0.56, 0.80]	0.61 [0.53, 0.70]	3.11 [1.95, 4.94]	1.02 [0.85, 1.23]

Note: aRRR=Adjusted relative risk ratio. Alcohol-use-only is defined as past-year alcohol use and no report of past-year cannabis or simultaneous use. Cannabis-use-only is defined as past-year cannabis use and no report of past-year alcohol or simultaneous use. Models adjusted for parental education, race/ethnicity, and survey mode.