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

Table 1 Descriptive data of the young and old age groups

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

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.

ISSN: 1749-799X