Table 4.

Screening instrument performance in identifying illicit drug use by race, site, trimester and receipt of public assistance.

	SURP-P			WIDUS			CRAPPT			5Ps			NIDA Quick Screen			Interaction significance (P)
	Acc.	Sens.	Spec.	Acc.	Sens.	Spec.	Acc.	Sens.	Spec.	Acc.	Sens.	Spec.	Acc.	Sens.	Spec.	Acc.	Sens.	Spec.
Race/ethnicity																< 0.01	0.57	< 0.01
Black (n = 480)	0.67	0.51	0.73	0.68	0.63	0.70	0.72	0.34	0.86	0.52	0.80	0.42	0.81	0.31	0.99
White (n = 444)	0.55	0.61	0.55	0.86	0.76	0.87	0.62	0.45	0.64	0.31	0.91	0.26	0.94	0.22	0.99
Hispanic, (n = 190)	0.67	0.29	0.74	0.63	0.39	0.68	0.78	0.21	0.88	0.46	0.64	0.43	0.87	0.19	0.98
Site																< 0.01	0.38	< 0.01
New Haven (n = 554)	0.67	0.47	0.71	0.70	0.63	0.71	0.75	0.30	0.84	0.49	0.75	0.44	0.87	0.20	0.99
Detroit (n = 333)	0.65	0.51	0.72	0.67	0.61	0.70	0.69	0.35	0.84	0.50	0.82	0.37	0.79	0.34	0.99
Boston (n = 333)	0.55	58	0.55	0.92	0.75	0.93	0.62	0.58	0.62	0.29	0.92	0.26	0.97	0.17	10.00
Trimester																0.13	0.03	NA
First (n = 430)	0.65	0.44	0.70	0.78	0.59	0.83	0.68	0.27	0.78	0.45	0.70	0.39	0.86	0.29	10.00
Second (n = 394)	0.63	0.51	0.66	0.74	0.66	0.76	0.69	0.41	0.76	0.44	0.87	0.34	0.87	0.34	0.99
Third (n = 396)	0.62	0.58	0.62	0.73	0.64	0.74	0.73	0.37	0.77	0.42	0.87	0.38	0.89	0.11	0.98
Public assistance																< 0.01	0.60	< 0.01
Yes (n = 539)	0.69	0.52	0.75	0.63	0.65	0.62	0.73	0.34	0.87	0.53	0.79	0.44	0.80	0.27	0.98
No (n = 668)	0.59	0.45	0.60	0.86	0.53	0.88	0.67	0.35	0.70	0.36	0.80	0.32	0.94	0.28	1.00

SURP-P = Substance Use Risk Profile–Pregnancy; WIDUS = Wayne Indirect Drug Use Screener; CRAFFT = acronym for five-item screener with items related to car, relax, alone, forget, friends and trouble; 5Ps = parents, peers, partner, pregnancy, past; Acc. = accuracy, defined as overall rate of agreement (true positives + true negatives/full sample); sens. = sensitivity; spec. = specificity; NA = not applicable. Accuracy, sensitivity and specificity were calculated using published cut scores.