The Egyptian Journal of Neurology, Psychiatry and Neurosurgery

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 value	P value
Pre-treatment	7.00 ± 1.45	7.40 ± 1.27	− 0.927	0.360 (NS)
Post-treatment	3.55 ± 0.83	2.00 ± 0.86	5.820	0.001 (S)
Mean difference	3.45	5.40
% change	49.29	72.97
t value	14.693	23.081
p value	0.001 (S)	0.001 (S)

NS not significant, S significant, VAS visual analogue scale

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