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Mean scores for the 6 VAS assessments. A, Mean drug liking VAS scores by hydromorphone challenge dose. B, Mean “any drug effect” VAS scores by hydromorphone challenge dose. C, Mean “bad drug effect” VAS scores by hydromorphone challenge dose. D, Mean “drug high” VAS scores by hydromorphone challenge dose. E, Mean “good drug effect” VAS scores by hydromorphone challenge dose. F, Mean “sedation” VAS scores by hydromorphone challenge dose.
