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Table 2 Efficacy of intrathecal implants in failed back syndrome (n between 20 and 24)

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

Dimension Variable Pre-Treatment Median (Quartiles) Post-Treatment Median (Quartiles) Z Scorea P valueb
Sensory Pain 9.50 (8.00, 10.00) 5.00 (4.00, 6.00) 4.22 <0.00006*
  Pain Relief 9.00 (8.00, 10.00) 3.50 (2.75, 6.25) 4.01 <0.00006*
Psychological Depression 9.00 (7.00, 10.00) 4.00 (0.00, 6.00) 4.01 <0.00006*
  Quality of Life 10.00 (8.00, 10.00) 5.00 (3.00, 7.75) 3.79 <0.00022*
  Coping 8.00 (7.00, 10.00) 5.00 (4.00, 7.00) 3.68 <0.00032*
  Dependency 8.00 (6.00, 10.00) 6.00 (3.00, 8.00) 3.09 <0.0027*
Sociological Sleep 9.50 (8.00, 10.00) 6.00 (4.00, 9.00) 3.06 <0.0027*
  Work 10.00 (9.75, 10.00) 10.00 (8.25, 10.00) 1.20 0.2301
  Social Life 10.00 (9.00, 10.00) 6.50 (4.00, 8.00) 3.25 <0.00137*
  Sex Life 9.50 (8.25, 10.00) 8.50 (5.00, 10.00) 2.12 0.0340
  Driving 5.00 (2.00, 9.00) 2.00 (0.00, 6.00) 3.32 <0.00097*
  Housework 10.00 (8.00, 10.00) 6.00 (4.00, 8.00) 3.83 <0.00014*
  Mobility 10.00 (9.00, 10.00) 6.50 (5.25, 9.00) 3.01 <0.0027*
  1. a The Z score is converted from the Wilcoxon signed ranks test. b A Bonferroni adjustment for the number of tests indicates P < 0.005 (0.05/10) as significant.