MRI grading of spinal stenosis is not associated with the severity of low back pain in patients with lumbar spinal stenosis

Table 1 Correlations between demographics and NRS

	N = 293	NRS LBP	NRS Buttock and leg pain	NRS Buttock and leg numbness
		r_s	r_s	r_s
Age (years)	74 (68, 78)	−0.03	−0.04	0.02
Sex (male:female)	135:158	0.06	0.07	−0.11
Body mass index (kg/m²)	23.5 (21.2, 25.6)	−0.13*	− 0.03	− 0.14*
Appendicular skeletal muscle mass (kg)	16.0 (13.2, 20.1)	−0.15*	− 0.09	0.04
Trunk muscle mass (kg)	17.3 (15.0, 21.1)	−0.16*	−0.09	0.06
Duration of symptoms (months)	24 (11, 55)	0.07	−0.07	−0.01
Comorbidities (number, %)
Hypertension	181 (61.8)	0.08	0.06	0.03
Diabetes	86 (29.4)	0.01	−0.10	−0.14*
Dyslipidemia	83 (28.3)	0.01	0.06	0.01
Heart disease	63 (21.5)	0.04	0.01	0.04
Pulmonary disease	24 (8.2)	0.01	0.01	0.03
Number of comorbidities	1 (1, 2)	0.07	0.05	0.02
NRS
Back pain	5 (3, 7)		0.52*	0.46*
Buttock and leg pain	6 (4, 8)	0.52*		0.62*
Buttock and leg numbness	5 (3, 8)	0.46*	0.62*
SF-36
Physical functioning	55 (35, 70)	−0.22*	−0.27*	−0.22*
Bodily pain	32 (22, 51)	− 0.34*	− 0.48*	− 0.28*
Role physical	50 (25, 68.8)	− 0.18*	− 0.26*	− 0.13*
Role emotional	50 (33.3, 75)	−0.15*	−0.26*	− 0.10
Mental health	60 (47.5, 80)	−0.18*	− 0.26*	− 0.13*
Social functioning	62.5 (50, 87.5)	−0.15*	− 0.23*	− 0.10
Vitality	50 (31.3, 68.8)	−0.27*	−0.29*	− 0.15*
General health	50 (40, 60)	−0.26*	−0.20*	− 0.17*

Median (first quartile, third quartile). r_s, Spearman’s rank correlation coefficient, *P < 0.05
NRS numerical rating scale; SF-36 Medical Outcomes Study 36-item Short-Form General Health Survey

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