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Table 2 Comparison of mean scores of VAS 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)t valueP value
Pre-treatment7.00 ± 1.457.40 ± 1.27− 0.9270.360 (NS)
Post-treatment3.55 ± 0.832.00 ± 0.865.8200.001 (S)
Mean difference3.455.40 
% change49.2972.97
t value14.69323.081
p value0.001 (S)0.001 (S)
  1. NS not significant, S significant, VAS visual analogue scale