Table 2.

Multivariate logistic regression analysis for the osteoporotic compression fracture risk according to quantity and quality of multifidus muscles

Variables		Fracture Risk
		Crude		Adjusteda
		OR (95% CI)	P value	OR (95% CI)	P value
CSA of multifidus	on L4-5	1.00 (1.00, 1.00)†	0.25	1.00 (0.99, 1.00)†	0.38
	on L5-S1	1.00 (0.99, 1.00)†	0.33	1.00 (1.00, 1.00)†	0.10
PMF of multifidus	on L4-5	0.88 (0.84, 0.92)	< 0.05*	0.87 (0.82, 0.92)†	< 0.05*
	on L5-S1	0.92 (0.89, 0.95)†	< 0.05*	0.91 (0.88, 0.95)†	< 0.05*

OR, odds ratio; CI, confidence interval; CSA, cross-sectional area; PMF, percentage of muscle fibers in the multifidus muscle calculated by subtracting the fat area from the CSA and multiplying it by 100

* P < 0.05

† P value of Hosmer and Lemeshow goodness-of-fit tests > 0.05

^a Adjusted for age, body mass index, bone mineral density, and psoas index