Table 2. Secular changes of lumbar spinal findings on MRI and symptoms over a 3-year period.

	2014	2015	2016
Lumbar disc degeneration (cases)	2	8	9
Lumbar spondylolysis (cases)	0	1	4
Lumbar disc protrusion and extrusion (cases)	0	0	2
Presence of low back pain (cases)	0	1	3