Table 1.

Internal consistency estimates (Cronbach’s α) at Wave 1 for full sample and by race/ethnicity

		Race/ethnicity
Scale	Full sample Cronbach’s α [95% CI] (N = 1,932)	AI Cronbach’s α [95% CI] (n = 435)	AI and White Cronbach’s α [95% CI] (n = 352)	White Cronbach’s α [95% CI] (n = 901)	p
Alcohol Availabilitya	.83 [.82, .84]	.83 [.80, .85]	.79 [.75, .82]	.84 [.82, .85]	.02
Drinking Places	.89 [.88, .90]	.88 [.86, .89]	.89 [.87, .91]	.90 [.89, .91]	.18
Alcohol Acquisition	.89 [.88, .90]	.88 [.86, .90]	.88 [.86, .90]	.89 [.88, .90]	.60
Police Enforcementb	.79 [.78, .81]	.79 [.76, .83]	.77 [.73, .81]	.78 [.75, .80]	.78
Alcohol Norms	.65 [.63, .68]	.66 [.61, .71]	.61 [.55, .67]	.68 [.64, .71]	.17
Alcohol Expectancies	.73 [.71, .74]	.74 [.70, .77]	.68 [.63, .73]	.74 [.71, .76]	.05
Social Support	.82 [.81, .83]	.81 [.78, .84]	.81 [.77, .84]	.83 [.82, .85]	.49
Parent Communication	.70 [.68, .72]	.73 [.69, .77]	.71 [.65, .76]	.69 [.66, .73]	.57
DUI Risk	.56 [.53, .59]	.46 [.37, .54]	.62 [.54, .68]	.63 [.58, .67]	.01
Alcohol Consequences	.98 [.98, .98]	.98 [.97, .98]	.98 [.98, .99]	.98 [.98, .98]	1.00
Adult Problems	.58 [.54, .61]	.58 [.49, .65]	.57 [.47, .65]	.60 [.54, .65]	.90
Early Alcohol Risk	.87 [.86, .88]	.87 [.85, .89]	.87 [.84, .89]	.88 [.86, .89]	.77
Socioeconomic Status	.59 [.56, .61]	.57 [.50, .63]	.55 [.48, .62]	.62 [.58, .66]	.29
Depression	.84 [.83, .85]	.86 [.84, .88]	.82 [.79, .85]	.85 [.83, .86]	.06
AI Cultural Identity	.89 [.89, .90]	.91 [.89, .92]	.87 [.84, .89]	.84 [.82, .85]	<.01
White Cultural Identity	.93 [.92, .93]	.93 [.92, .94]	.92 [.91, .94]	.92 [.91, .93]	.42

Notes: Full sample includes n = 244 students who were other or missing race/ethnicity. AI = American Indian; CI = confidence interval; DUI: driving under the influence of alcohol.

^aAlcohol availability = perceived alcohol availability;

^bpolice enforcement = perceived police enforcement.