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Table 1 Basic demographic data results for chronic LBP patients receiving screening ZJ blocks

From: Zygapophysial joint blocks in chronic low back pain: a test of Revel's model as a screening test

  All patients (n = 151) Excluded patients (n = 35) Included patients (n = 116) Significance
Variable Mean Median STD Mean Median STD Mean Median STD p value
Age (years) 44.3 43.0 13.2 48.03 48.0 14.3 43.2 41.5 12.6 0.09
Duration of current symptoms (weeks) 147.1 91.0 170.2 103.7 74.0 93.5 160.2 104.0 186.2 0.08
Time off work (weeks) 89.5 (n = 69) 74.0 82.4 55.4 (n = 15) 56.0 41.3 99.0 (n = 54) 82.0 88.6 0.04*
VAS (today) 55.9 61.0 24.6 50.8 53.0 27.0 57.4 62.0 23.7 0.24
VAS (at best) 30.3 27.0 22.5 24.6 15.0 22.5 32.0 30.5 22.3 0.06
VAS (at worst) 85.8 89.0 13.3 80.6 87.0 18.4 87.4 90.0 10.9 0.07
Roland Morris Questionnaire 17.8 19.0 4.8 18.0 19.0 4.6 17.7 19.0 4.8 0.68
Zung Depression Index 29.7 29.0 11.6 26.1 26.0 11.8 30.7 30.0 11.4 0.06
MSPQ Questionnaire 9.7 9.0 6.8 8.8 8.0 6.4 9.9 9.0 7.0 0.49
% Male 53.0    47.1    54.7    0.55
% Smoker 34.4    35.3    34.2    0.98
% Off work 50.0    44.1    51.7    0.33
% Previous spinal surgery 28.8    17.7    28.2    0.14
% traumatic onset 69.5    73.5    68.4    0.78
  1. Notes: 1. p value refers to comparisons between included and excluded patients
  2. * significant at p < 0.05