The Egyptian Journal of Neurology, Psychiatry and Neurosurgery

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 value	P value
Pre-treatment	52.95 ± 6.33	52.22 ± 14.45	− 0.406	0.685 (NS)
Post-treatment	50.40 ± 6.17	48.63 ± 14.29	− 0.298	0.766 (NS)
Mean difference	2.55	3.59
% change	4.82	6.87
Z value	− 3.925	− 3.926
p value	0.001 (S)	0.001 (S)

NS not significant, S significant

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