Table 2. Tests of differences between groups SMT and MDT (Mann–Whitney U).

Outcome variable	Spinal manipulative therapy (mean rank)	Mechanical diagnosis and therapy (mean rank)	P value
Between groups changes
Oswestry Disability Index	11·13	14·56	0·31
Numeric Pain Rating Scale	9·56	15·25	0·08
50% reduction in the Oswestry Disability Index	2 = yes	10 = yes	0·155
	6 = no	8 = no