2.2. Measures
2.2.1. Adolescent Diagnostic Interview
To help establish subject eligibility for the study, we
administered at baseline the substance use disorder module
of the Adolescent Diagnostic Interview (ADI) to assess
DSM-IV criteria for abuse and dependence (Winters &
Henly, 1993). This highly structured interview covers all
abuse and dependence criteria for any substance used five or
more times during the prior 12 months. We assessed current
(prior year) diagnosis. There are extensive test–retest
reliability and validity psychometric data on the ADI
(Winters & Henly, 1993; Winters, Stinchfield, Fulkerson,
& Henly, 1993). At follow-up, we assessed with the ADI
prior 6 months presence of abuse and dependence symptoms
for alcohol and cannabis.