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Table 1 Study group characteristics

From: The paradoxical relationship between ligamentum flavum hypertrophy and developmental lumbar spinal stenosis

  Group 1 (Critical DSS) Group 2 (Relative DSS) Group 3 (Non- DSS) p-value
Vertebral Levels 27 148 15  
Gender F: 11 F: 19 F: 4 0.65
M: 6 M: 10 M:10
Mean Age at Surgery (Years (±SD)) F: 68.0 (11.0) F: 67.1 (10.4) F: 64.5 (9.0) 0.26
M: 67.0 (10.3) M: 62.1 (12.9) M: 47.4 (26.8)
Mean LF thickness (mm (±SD)) R: 3.8 (1.4) R: 3.4 (1.7) R: 3.1 (0.6) R: 0.45
L: 4.0 (1.7) L: 3.4 (1.6) L: 3.3 (1.1) L: 0.30
Mean Spinal Canal Diameter (mm (±SD)) 12.7 (1.3) 15.4 (1.3) 17.7 (2.6) <0.001*
Mean Disc Height (mm (±SD)) 10.4 (2.3) 9.9 (2.5) 9.7 (2.9) 0.58
BMI (±SD) 22.8 (2.3) 24.3 (3.2) 26.7 (3.7) 0.06
  1. LF ligamentum flavum, BMI body mass index, SD standard deviation, F female, M male, R right, L left
  2. *significant difference between three study groups