. Author manuscript; available in PMC: 2014 Sep 10.

Published in final edited form as: Psychol Addict Behav. 2008 Mar;22(1):78–87. doi: 10.1037/0893-164X.22.1.78

Table 5.

Agreement Between Urine Drug Test Result and Timeline Follow-Back Data for Cocaine Use

	3-day detection window			5-day detection window
Reporter of cocaine use	% agreement	κ	Yule's Y	% agreement	κ	Yule's Y
Subject	.84	.53	.68	.87	.65	.80
Collateral^a	.72			.77	.30	.53

Note. n = 159 subjects with urine drug test results. Urine drug test results were coded as positive/negative for cocaine use. Timeline Follow-Back data were coded yes/no for cocaine use within each detection window. Boldface values of Yule's Y (≥ .50) reflect acceptable subject-collateral agreement.

Values for kappa and Yule's Y could not be computed for the 3-day detection window because there were no collateral reports of subject cocaine use within the 3-day window (i.e., cell counts = 0).