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CHARACTERISTICS CHRONIC OXYCODONE USERS (N = 103) COMPARISON GROUP (N = 104) P VALUE Mean (SD) age, y 52.3 (13.1) 51.9 (16.7) > .05 Sex, % > .05 • Male 53.9 51.5 • Female 46.1 48.5 Mean (SD) no. visits in 5-y period 39.0 (19.0) 12.8 (13.6) < .001 Mean (SD) no. of health problems 6.3 (3.9) 3.1 (2.5) < .001 Proportion of patients with past or present • Alcohol or drug abuse 24.8 4.9 < .001 • Smoking 67.6 45.6 < .003 • Psychiatric illness 31.3 14.6 < .006 ORIGIN CHRONIC USERS, N (%) Musculoskeletal (other than back) 39 (37.9) Back 35 (34.0) Neurologic 2 (1.9) Gastrointestinal 6 (5.8) Other 21 (20.4)