Table 2. Comparisons of changes between groups on disc herniation index, sacral angle, and KODI.

Item	Group	Pre-test (M ± SD)	Post-test (M ± SD)
Disc herniation index (points)	Experimental group I	256.5 ± 23.6	186.7 ± 19.8**	*
	Experimental group II	265.6 ± 21.2	206.8 ± 18.2*
Sacral angle (°)	Experimental group I	37.2 ± 6.2	31.52 ± 5.2**
	Experimental group II	36.2 ± 7.2	34.52 ± 6.5	**
KODI (points)	Experimental group I	26.4 ± 4.2	16.3 ± 6.3**
	Experimental group II	26.1 ± 2.3	17.6 ± 6.2**

*p<0.05, **p<0.01.

Data are presented as mean ± SD, paired t-test, analysis of covariance.

KODI: Korean Oswestry Disability Index.