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. Author manuscript; available in PMC: 2010 Jun 1.
Published in final edited form as: Eval Rev. 2009 Apr 7;33(3):211–225. doi: 10.1177/0193841X09333253

Table 1.

Cross-Tabulation of Responses to the 48-Hour Drug Use Question and the Results of Biological Assay for Any Drug Use

Negative Test
Result		 Positive Test
Result		 Total
No 48-hour drug use 255 (.876) 036 (.124) 291 (1.00)
Yes 48-hour drug use 018 (.257) 052 (.743) 070 (1.00)