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Table 1 Information used to define the four categories of cannabis use

From: Cannabis use and involuntary admission may mediate long-term adherence in first-episode psychosis patients: a prospective longitudinal study

Cannabis use category

DSM-IV abuse or dependence

Addiction Severity Index (ASI) score

Dependence

Meet minimal or more DSM-IV criteria for cannabis dependence

8–9: extreme problem, treatment absolutely necessary

Abuse

Meet ≥1 criteria for cannabis abuse

4–5: moderate problem, some treatment indicated

6–7: considerable problem, treatment necessary

Use

Meet abuse criteria but do not meet temporal criteria (at least 12 months) or use for 12 months but not fulfilling any criteria of DSM-IV abuse

2–3: slight problem, substance abuse treatment probably not necessary

No use

No significant symptoms

0–1: no real problem

  1. Note: DSM-IV, Diagnostic Statistical Manual of Mental Disorders (fourth edition).