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Annual mean costs of fibromyalgia patients according to severity of pain as assessed by the Brief Pain Inventory (BPI). The range of the BPI is from 0 to 10. The three levels of pain severity are mild (BPI <4; n = 9), moderate (BPI ≥ 4 to <7; n = 76), and severe (BPI ≥ 7; n = 115). Health care costs are split into components.
