Table 3.

Regression analysis of the relationship between the postoperative paraspinal muscle volume loss and age

Age vs	MRI (n = 24)		p-value	CT (n = 16)		p-value
	β coefficient	Adjusted R2		β coefficient	Adjusted R2
Changes of MF (cm3)
Right	−0.592	0.321	0.002a	−0.076	− 0.065	0.780
Left	− 0.489	0.204	0.015a	0.114	−0.057	0.674
Changes of ES (cm3)
Right	0.203	−0.002	0.342	−0.590	0.301	0.016a
Left	0.267	0.029	0.207	−0.281	0.013	0.292
Changes of Psoas (cm3)
Right	0.184	−0.010	0.388	0.019	−0.071	0.945
Left	0.155	−0.020	0.469	0.189	−0.033	0.482

MRI magnetic resonance imaging, CT computed tomography, SD standard deviation, MF multifidus, ES erector spinae

^aStatistically significant difference was defined as p < 0.05