As reported in detail elsewhere, the reliability and validity were good to excellent for cannabis use and cannabis use disorder diagnoses (Grant et al. 1995; 2003; 2004; Chatterji et al., 1997; Cottler et al., 1997; Pull et al., 1997; Ustun et al., 1997; Vrasti et al., 1997; Canino et al., 1999; Nelson et al., 1999; Compton et al., 2004). Reliability (Chatterji et el., 1997) and validity (Cottler et al., 1997) for cannabis abuse and dependence symptom criteria were fair to good as assessed in clinical reappraisal studies conducted by psychiatrists using a semi-structured diagnostic interview. Intraclass correlations (ICCs) of cannabis abuse and dependence criteria derived from a test-retest study of the general population (Grant et al., 1995) were excellent (ICCs=0.86–0.88) as was the kappa value (κ=0.78).
