Validation of CRAFFT for Use in Youth Correctional Institutions in Lagos, Nigeria

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Figure 1.
The receiver operating characteristic curve for CRAFFT.

Table 1

The Six Crafft Questions²⁰

Have you ever ridden in a CAR or MOTOR CYCLE driven by someone (including yourself) who was “high” or been using alcohol or drugs?

Do you ever use alcohol or drugs to RELAX, feel better about yourself or fit in?

Do you ever use alcohol or drugs while you are by yourself (i.e ALONE)?

Do you ever FORGET things you did when using alcohol or drugs?

Do your FAMILY or FRIENDS ever tell you that you should cut down on your drinking or drug use?

Have you ever got into TROUBLE while you were using alcohol or drugs?

Table 2

Psychometric Properties of Crafft in Screening for Substance Use Among Adolescents in Youth Correctional Institution

Score	Sensitivity	Specificity	PPV	NPV	LR Positive	95% CI	Posterior Probability	95% CI	LR Negative	95% CI	Posterior Probability	95% CI
>1	0.913	0.812	0.875	0.866	4.856	2.25–10	59%	40%–74%	0.107	0.01–0.92	3%	0%–21%
>2	0.870	0.812	0.869	0.813	4.628	2.11–10	57%	38%–74%	0.160	0.03–0.89	4%	1%–21%
>3	0.478	0.875	0.846	0.538	3.824	1.19–12	53%	26%–78%	0.597	0.31–1.14	15%	8%–25%
>4	0.261	0.937	0.856	0.468	4.143	0.71–24	55%	17%–87%	0.789	0.53–1.18	19%	13%–20%