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Table 2 Correlation of the dural sac area with patient symptoms and walking capacity

From: Visually assessed severity of lumbar spinal canal stenosis is paradoxically associated with leg pain and objective walking ability

  ODI scale VAS overall scale NRS LBP NRS LP Beck depression index Treadmill test
Central spinal canal (mm2) r = 0.086 r = -0.036 r = -0.004 r = 0.023 r = -0.099 r = -0.145
  P = 0.448 P = 0.752 P = 0.972 P = 0.841 P = 0.380 P = 0.200
  1. r = Spearman correlation coefficients.
  2. P = P values.
  3. ODI = Oswestry Disability Index (0–100).
  4. VAS overall = Visual analog pain scale (0–100).
  5. NRS LBP = Numerical rating scale low back pain at rest (0–10).
  6. NRS LP = Numerical rating scale leg pain at walking (0–10).
  7. Treadmill exercise test (0–1000 m).
  8. BDI = Beck Depression Inventory (0–63).