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Table 1 Demographic data

From: Patient demographics and MRI-based measurements predict redundant nerve roots in lumbar spinal stenosis: a retrospective database cohort comparison

  All RNR+ RNR- Mean diff. (p-value) [95% C.I.]
Number of patients (n) 300 150 150  
Age (years) 73.5 ± 9.2 74.8 ± 8.2 72.1 ± 9.9 2.6 (p = 0.01) [− 4.7 to − 0.6]
Body height (cm) 173.2 ± 10.2 171.7 ± 9.9 174.6 ± 10.3 2.9 (p = 0.01) [0.6 to 5.2]
LLS (mm) 157.6 ± 12.6 153.2 ± 12.3 162.1 ± 11.3 8.9 (p < 0.001) [6.2 to 11.5]
SLLS (mm) 159.6 ± 11.8 156.1 ± 11.5 163.7 ± 11.0 7.5 (p < 0.001) [4.8 to 10.1]
rLLS (%) 13.4 ± 1.0 13.0 ± 0.9 13.7 ± 0.8 0.7 (p < 0.001) [0.5 to 0.9]
rSLLS (%) 13.6 ± 0.9 13.3 ± 0.9 13.9 ± 0.8 0.6 (p < 0.001) [0.4 to 0.8]
LSAD (mm) 2.6 ± 2.6 2.9 ± 2.7 2.3 ± 2.4 0.5 (p = 0.07) [− 1.1 to 0.05]
Gender Male (%) 196 (65.3) 94 (62.7) 102 (68.0) X2 (1) = 0.94 (p = 0.3)
Female (%) 104 (34.7) 56 (37.3) 48 (32.0)
  1. Values are mean ± SD for age, body height, length of lumbar spine (LLS), segmental length of lumbar spine (SLLS), relative length of lumbar spine (rLLS), relative segmental length of lumbar spine (rSLLS), LSAD and frequency (%) for gender