Psychometric evaluation of the Customary Drinking and Drug Use Record (CDDR): a measure of adolescent alcohol and drug involvement.

OBJECTIVE The present study was undertaken to assess the psychometric characteristics of the Customary Drinking and Drug Use Record (CDDR), an interviewer-administered questionnaire. The CDDR provides current (past 3 months) and lifetime measures of four alcohol- and other drug-related domains: level of involvement, withdrawal characteristics, psychological/behavioral dependence symptoms, and negative consequences. The present report describes the evaluation of the psychometric properties of the instrument with youth between the ages of 13 and 22 years who had markedly variable histories of involvement with alcohol and other psychoactive substances. METHOD The sample assessed was composed of 166 adolescents recruited from two inpatient substance abuse treatment programs and 115 adolescents recruited from the community. Of the 281 subjects, 150 were male. Follow-up interviews with each adolescent and a resource person were conducted 6, 12, 24 and 48 months after the initial assessment. RESULTS Reliability of the CDDR was assessed by examination of internal consistency, test-retest reliability and interrater reliability. Convergent, discriminant and construct validity were evaluated for each of the CDDR domains, and gender and ethnic differences on substance involvement were examined. The CDDR was found to be internally consistent and reliable over time and across interviewers for each major domain assessed. The findings supported the validity of the four domains of alcohol and other drug involvement assessed on the CDDR. CONCLUSIONS The present results demonstrated convergent validity of the CDDR, ability to differentiate abusing from nonabusing youth and strong diagnostic specificity when compared to other standard instruments. The solid psychometric characteristics of the CDDR support its use for both research and clinical purposes.