Substance Abuse Treatment, Prevention, and Policy

Table 4 Performance of ASSIST-FC scores by age

From: Test characteristics of shorter versions of the Alcohol, Smoking and Substance Involvement Screening Test (ASSIST) for brief screening for problematic substance use in a population sample from Israel

	AUC (95% CI)				Difference in AUC (95% CI)^a
Substance	18–25	26–34	35–49	50–70	26–34 vs. 18–25	35–49 vs. 18–25	50–70 vs. 18–25
Tobacco	0.96 (0.93, 0.98)	0.97 (0.96, 0.98)	0.96 (0.94, 0.98)	0.96 (0.94, 0.97)	0.01 (-0.01, 0.04)	0.00 (-0.03, 0.03)	0.00 (-0.03, 0.03)
Alcohol	0.88 (0.83, 0.92)	0.83 (0.78, 0.87)	0.86 (0.82, 0.90)	0.89 (0.84, 0.94)	-0.05 (-0.12, 0.01)	-0.02 (-0.08, 0.05)	0.01 (-0.06, 0.08)
Cannabis	0.91 (0.87, 0.96)	0.93 (0.90, 0.96)	0.93 (0.91, 0.96)	0.98 (0.96, 1.00)	0.02 (-0.04, 0.07)	0.02 (-0.03, 0.08)	0.06 (0.01, 0.11)
Cannabis (8 + threshold)	0.92 (0.87, 0.97)	0.94 (0.91, 0.97)	0.95 (0.92, 0.98)	0.95 (0.91, 0.99)	0.02 (-0.04, 0.08)	0.03 (-0.03, 0.09)	0.03 (-0.04, 0.09)
Sedatives	0.99 (0.97, 1.02)	0.96 (0.90, 1.02)	0.96 (0.90, 1.01)	0.94 (0.89, 0.98)	-0.03 (-0.10, 0.29)	-0.04 (-0.09, 0.24)	-0.05 (-0.11, -0.00)
Prescription stimulants	0.89 (0.81, 0.96)	0.92 (0.86, 0.98)	0.97 (0.94, 1.01)	0.98 (0.93, 1.02)	0.03 (-0.06, 0.13)	0.09 (0.01, 0.17)	0.09 (0.00, 0.18)
Prescription painkillers	0.84 (0.67, 1.01)	0.95 (0.87, 1.03)	0.91 (0.83, 0.98)	0.95 (0.89, 1.01)	0.11 (-0.08, 0.30)	0.07 (-0.12, 0.26)	0.11 (-0.07, 0.29)

FC = frequency and concern; AUC = area under the curve; CI = confidence interval
a AUC differ significantly where the 95% CI around the difference does not include 0; significant differences are shown in italics

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