Table 1.

Stage of substance use of AI-SUPERPFP respondents aged 18–44 years by gender and tribe.

	Prevalence of lifetime use
	Stage 0: Lifetime abstainer		Stage 1A: Lifetime alcohol use (only)		Stage 1B: Lifetime marijuana and/or inhalant use		Stage 2: Lifetime use of other illicit drug(s)		Total
	#	Column %	#	Column %	#	Column %	#	Column %	#	Column %
Males
Northern Plains	127	55.64%	165	58.68%	150	57.50%	111	62.38%	553	58.33%
Southwest	105	44.36%	107	41.32%	105	42.50%	68	37.62%	385	41.67%
Total	232	100.00%	272	100.00%	255	100.00%	179	100.00%	938	100.00%
Row percent	25.17%		28.44%		26.73%		19.66%		100.00%
Females
Northern Plains	179	35.41%	178	55.72%	139	58.56%	95	75.22%	591	50.43%
Southwest	281	64.59%	128	44.28%	101	41.44%	31	24.78%	541	49.57%
Total	460	100.00%	306	100.00%	240	100.00%	126	100.00%	1132	100.00%
Row percent	40.64%		27.03%		21.20%		11.13%		100.00%
Both genders
Northern Plains	306	42.53%	343	57.13%	289	58.01%	206	67.56%	1144	54.09%
Southwest	386	57.47%	235	42.87%	206	41.99%	99	32.44%	926	45.91%
Total	692	100.00%	578	100.00%	495	100.00%	305	100.00%	2070	100.00%
Row percent	33.15%		27.67%		23.89%		15.28%		100.00%

Stage of substance use: Respondents were assigned stage of substance use by lifetime reports of: abstinence, alcohol only, marijuana and/or inhalants with or without alcohol, and other illicit drug(s) with or without use of the previously listed substances. Other illicit drugs include cocaine, hallucinogens, non-ceremonial use of peyote, stimulants, heroin, sedatives, analgesics and tranquilizers.

Sample sizes are unweighted while the percents were calculated using survey weights to account for sampling and non-response.