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Table 3 Comparison between mean scores of Oswestry Disability Index within and between both groups

From: Efficacy of spinal extension exercise program versus muscle energy technique in treatment of chronic mechanical low back pain

 Group A (n = 20)Group B (n = 20)Z valueP value
Pre-treatment52.95 ± 6.3352.22 ± 14.45− 0.4060.685 (NS)
Post-treatment50.40 ± 6.1748.63 ± 14.29− 0.2980.766 (NS)
Mean difference2.553.59 
% change4.826.87
Z value− 3.925− 3.926
p value0.001 (S)0.001 (S)
  1. NS not significant, S significant