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Table 1 Descriptive data of the young and old age groups

From: The effect of age on sagittal plane profile of the lumbar spine according to standing, supine, and various sitting positions

Factors Young age group Old age group P values
Enrolled number 10 10  
Sex Male: 10 Male:10  
Age (years) 25.4 ± 2.3 66.7 ± 1.7 <0.001
Height (cm) 175.3 ± 3.5 168.8 ± 5.3 0.021
Weight (kg) 75.1 ± 8.2 73.6 ± 8.5 0.967
Body mass index 24.4 ± 2.6 25.8 ± 1.9 0.121
Disc degeneration* (average value) L1/2: 0.0 L1/2: 0.8  
L2/3: 0.1 L2/3: 1.6
L3/4: 0.2 L3/4: 1.8
L4/5: 0.2 L4/5: 1.7
  L5/S1: 0.0 L5/S1: 1.8
  1. For statistical analysis, Mann–Whitney test was used. *For grading disc degeneration, simple radiography was used and the guideline by Lawrence JS et al. was used. Grade 1 is defined as the status of a slight anterior wear of the vertebral body and osteophyte formation; grade 2 is defined as the status of definite anterior wear of vertebral body and osteophyte formation; grade 3 is defined as the status of osteophyte formation and narrowing of disc; grade 4 is defined as the status of large osteophyte formation, marked disc narrowing, sclerosis of vertebral plates, and posterior subluxation.