Abstract
Given increasing opioid use in patients with chronic noncancer pain, it is essential to evaluate the impact of opioid utilization and switching on the patient and the healthcare system. The Opioid Utilization Study (OPUS) is an ongoing 12-month, multicenter, prospective, observational cohort study examining opioid treatment outcomes and the economic impact of opioid utilization in patients with chronic noncancer pain. As part of OPUS, opioid-treated patients (aged ≥18 years) completed the Brief Pain Inventory (BPI) short-form, a validated 10-point scale that measures pain (0 = no pain, 10 = worst possible pain), its interference with daily activities (0 = none, 10 = completely interferes), and pain relief from current medication (0 = no relief, 10 = complete relief).
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