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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Addict Behav. 2009 Oct 22;35(3):273. doi: 10.1016/j.addbeh.2009.10.009

Figure 1.

Figure 1

Item characteristic curves (ICCs) for criterion symptoms of hallucinogen use disorders among past-year hallucinogen users aged 12–17 years (N = 1548). A1 = role interference; A2 = hazardous use; A3 = problems with the law; A4 = relationship problems; D1 = tolerance; D2 = taking larger amounts; D3 = inability to cut down; D4 = time spent; D5 = giving up activities; D6 = continued use despite resulting medical or psychological problems.