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Table 2 Patient characteristics and distribution of MRI findings

From: A novel MRI index for paraspinal muscle fatty infiltration: reliability and relation to pain and disability in lumbar spinal stenosis: results from a multicentre study

Patient characteristics (n = 243) Mean ± standard deviation/count (%)
Age (years) 66.6 ± 8.5
Female 119 (49)
BMI 27.8 ± 4.0
Smokers 55 (23)
DSCA < 75 mm2
 L2/L3
 L3/L4
 L4/L5
31 (19)
106 (44)
157 (65)
ODI score (100-point scale) 40.66 ± 14.57
NRS back pain (10-point scale) 6.28 ± 2.19
NRS leg pain (10-point scale) 6.38 ± 2.10
ZCQ pain (5-point scale) 3.38 ± 0.55
ZCQ disability (5-point scale) 2.58 ± 0.52
MRI findings (L2/L3 level)
 MFI* 0.53 ± 0.18
GCS
 Category 0 (grade 0)
 Category 1 (grade 1)
 Category 2 (grades 2, 3, and 4)
119 (49)
100 (41)
24 (10)
  1. BMI Body mass index, DSCA Dural sac cross-sectional area, GCS Goutallier classification system, MFI Muscle fat index, NRS Numeric rating scale, ODI Oswestry disability index, ZCQ Zurich claudication score
  2. *In one case, the value of the MFI was > 1.0, redefined as 1.0