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Table 1 Patient characteristics

From: Long-term experience with implanted intrathecal drug administration systems for failed back syndrome and chronic mechanical low back pain

  Total Sample LBP FBS
  n = 36 n = 12 n = 24
Sex (male:female) 17:19 5:7 12:12
Age mean (SD) (in years) 54.80 (10.00) 56.33 (12.32) 54.00 (8.75)
Pain duration mean (SD) (in years) 13.61 (6.77) 8.89 (2.57) 15.55 (7.04)
Implant duration mean (SD) (in years) 4.38 (3.03) 2.18 (2.05) 5.48 (2.85)
Previous spinal operations median (range)    2 (1–11)
  1. LBP = Low Back Pain (without prior surgery); FBS = Failed Back Syndrome