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Table 1 Classification of cannabis use for selection of participants

From: Cognitive behavioral therapy program for cannabis use cessation in first-episode psychosis patients: study protocol for a randomized controlled trial

Severity of consumption DSM-IV-TRa criteria for abuse or dependence Europ-ASIb scores
Dependence Meet at least minimal DSM-IV-TR criteria for cannabis dependence 8–9
Abuse Meet ≥1 DSM-IV-TR criteria for cannabis abuse 4–7
Use Meet DSM-IV-TR criteria for cannabis abuse but not the duration criterion (≥12 months) or ≥12 months of use but do not meet any DSM-IV-TR criteria for cannabis abuse 2–3
No use No significant symptoms 0–1
  1. aRevised Fourth Edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-TR) [37]
  2. bEuropean Addiction Severity Index (Europ-ASI) [37,38]