Table 4

Univariate and multivariate analyses of associations between patient characteristics and minimal clinically important difference

	Univariate analysis					Multivariate analysis
Variables	MCID non-achievement (N=31)		MCID achievement (N=177)		P value	OR	95% CI	P value
	Mean	(SD)	Mean	(SD)		OR	95% CI	P value
Age (years)	69.58	(11.09)	60.00	(12.99)	<0.0001	0.92	0.89 to 0.95	0.12
Male sex, n (%)	15	(48.4)	84	(47.5)	NS
BMI, kg/m²	25.57	(2.91)	25.95	(3.90)	0.88
Duration of symptoms (years)	2.05	(1.34)	2.65	(3.27)	0.983
mCCI	3.45	(1.46)	2.50	(1.81)	0.002	1.13	1.03 to 1.34	0.57
Preoperation
Back sng	4.54	(3.73)	4.33	(3.18)	0.74
Leg sng	3.16	(3.27)	3.36	(3.42)	0.72
Back pain	5.58	(3.53)	4.78	(3.58)	0.26
Leg pain	5.00	(3.64)	4.89	(3.88)	0.92
Post-operation
Back sng	2.42	(2.42)	1.71	(2.10)	0.12
Leg sng	3.19	(2.97)	0.96	(1.97)	<0.0001	0.75	0.64 to 0.86	0.007
Back pain	2.22	(2.52)	0.88	(1.87)	<0.0001	0.97	0.86 to 1.08	0.78
Leg pain	2.52	(2.74)	0.92	(2.00)	<0.0001	0.99	0.88 to 1.10	0.91
Analgesics use, n (%)	19	(61.3)	119	(67.2)	0.54
Diagnosis, n (%)
Spondylolisthesis	22	(71.0)	106	(59.9)	0.42
Disc herniation	9	(29.0)	78	(44.1)	0.12
Spondylotic stenosis	22	(71.0)	106	(59.9)	0.42

BMI, body mass index; mCCI, modified Charlson Comorbidity Index; MCID, minimal clinically important difference; NS, not significant.