Predictors of disclosure of continued cocaine use.

Lack of disclosure of substance use is common in research and treatment settings and is frequently higher at follow-up than at baseline interviews. The aim of this study was to determine predictors of cocaine use disclosure at follow-up among 525 individuals who reported and tested positive for baseline use. Measurements included self-reported quantity and frequency of use, and hair analysis by radioimmune assay. Forty-two percent of individuals with biochemical evidence of continued cocaine use denied this use. In adjusted analyses, self-reported substance abuse treatment contact after enrollment was associated with lower disclosure (OR 0.63, 95% CI 0.43, 0.93). Other predictors were race, hair cocaine level, and opiates in hair. Failure to stop use after seeking treatment may result in reduced disclosure of continued use, possibly because of unwillingness to admit failure.