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The the Brief Pain Inventory (BPI) measures the severity of pain and the degree to which the pain interferes with common activities of daily living.
Pain severity questions are rated on a scale of 0 to 10, where 0 = ‘No pain’ and 10 = ‘Pain as bad as you can imagine’, with patients asked to rate their pain in four items including, average, worst and least pain over the last week, and their pain right now. Pain severity is then calculated as an average of these four items. Whereas the benchmark for average pain is based on the single average pain item only.
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