BMC Psychiatry

Table 5 Validity of self-reported substance use compared to urine test over the past three months

From: Diagnostic capabilities of self-reported psychoactive substance use among patients admitted to psychiatric consultations in Benin, West Africa

		Urine test				Urine test
Alcohol		+	-	Tobacco		+	-
Self-report	Yes	14	43	Self-report	Yes	28	19
	No	20	80		No	20	90
PPV			25%	PPV			60%
NPV			80%	NPV			82%
Se			41%	Se			58%
Sp			65%	Sp			95%
Kappa			0.05	Kappa			0.41
		Urine test				Urine test
Cannabis		+	-	Cocaine		+	-
Self-report	Yes	13	5	Self-report	Yes	2	1
	No	43	96		No	0	154
PPV			72.2%	PPV			67%
NPV			69%	NPV			100%
Se			23%	Se			100%
Sp			95%	Sp			98%
Kappa			0.21	Kappa			0.79
		Urine test				Urine test
Morphine		+	-	Tramadol		+	-
Self-report	Yes	1	4	Self-report	Yes	2	3
	No	2	154		No	6	146
PPV			33.3%	PPV			40%
NPV			99%	NPV			96%
Se			33.3%	Se			25%
Sp			97%	Sp			98%
Kappa			0.23	Kappa			0.28
		Urine test				Urine test
Hallucinogens		+	-	Anxiolytics/Hypnotics		+	-
Self-report	Yes	0	0	Self-report	Yes	3	1
	No	2	155		No	19	134
PPV			0	PPV			75%
NPV			99%	NPV			88%
Se			0	Se			14%
Sp			100%	Sp			1%
Kappa			0	Kappa			0.24
		Urine test
All substances		+	-
Self-report	Yes	57	25
	No	35	40
PPV			70%
NPV			60%
Se			66%
Sp			64%
Kappa			0.46

PPV Positive predictive value, NPV Negative predictive value, Se Sensitivity, Sp Specificity

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ISSN: 1471-244X

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