Table 6.

Risk factors associated with dissatisfied outcomes at midterm follow-up by multivariate logistic regression analysis

Factor		OR	95% CI	p-value
Multivariate modeling for dissatisfied functional improvement
	Female sex	3.41	0.97–12.05	0.057
	LFJOA	8.13	2.05–32.26	0.003**
	Preoperative ODI score	0.98	0.93–1.03	0.394
	Preoperative SF-36 PF score	1.01	0.97–1.06	0.625
	Preoperative SF-36 BP score	1.03	0.99–1.06	0.171
	Preoperative EQ-5D score	6.06	0.08–500.0	0.421
Multivariate modeling for dissatisfied relief of back pain
	Female sex	9.35	0.97–90.91	0.053
	Location of disc herniation (far-lateral vs. median & paramedian)	3.07	0.34–27.58	0.316
	Type of disc herniation (protrusion vs. bulge & extrusion)	12.7	1.19–136.3	0.036**
	LFJOA	7.87	1.21–52.63	0.031**
	Preoperative SF-36 BP score	1.02	0.96–1.07	0.567
	Preoperative EQ-5D score	35.7	0.06–1000	0.269

OR, odds ratio; CI, confidence interval; LFJOA, lumbar facet joint osteoarthritis; ODI, Oswestry Disability Index; SF-36 PF; 36-item Short Form Health Survey physical function; SF-36 BP, 36-item Short Form Health Survey bodily pain; EQ-5D, European quality of life-5 dimensions.

^**p<0.05.