Table 1. Comparison of VAS score and DH within each group.

	Group	Pre	Post
VAS	MTG**	6.5±1.8	4.38±1.4
score (point)	SDTG*	6.2±1.5	5.69±2.1
DH (mm)	MTG*	13.8±2.9	14.5±3.1
	SDTG	13.1±3.1	13.6±2.8

VAS, visual analog scale; DH, disc height; MTG, manual therapy group; SDTG, spinal decompression therapy group. * p<0.05 by paired t-test; ** p<0.01