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Table 1 The mean age of tramadol abusers and control subjects and mean ages for onset of abuse

From: Association between male sex hormones and tramadol abuse

  Mean±SD (years) (minimum-maximum)
Age of abusers (N = 67) 30.46 ± 6.14 (15–55)
Age of control subjects (N = 67) 29.5 ± 7.6 (16–54)
Age of onset of substance abuse 21.24 ± 5.9