Chunk #22 — 3. RESULTS — 3.1. Opioid Use and Related Behaviors by Subgroup

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Improved methods to identify stable, highly heritable subtypes of opioid use and related behaviors.

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We evaluated the validity of our five-cluster solution by comparing the clusters on the lifetime prevalence of substance use and psychiatric disorders (Table 3) and on opioid-related features (Table 4), as summarized below.