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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.