Table 6: Correlation between different MRI findings and years of work.

-		Years of Work										P.value
		< 5		6 - 10		11 - 15		16 - 20		> 20
		No.	%	No.	%	No.	%	No.	%	No.	%
loss of disc height	Yes	1	33.3	1	7.7	0	0.0	1	11.1	5	38.5	0.18
	No	2	66.7	12	92.3	5	100	8	88.9	8	61.5
posterior osteophytes	Yes	1	33.3	5	38.5	3	60.0	7	77.8	12	92.3	0.035
	No	2	66.7	8	61.5	2	40.0	2	22.2	1	7.7
Disc degeneration	Yes	1	33.3	3	23.1	2	40.0	7	77.8	13	100.0	0.001
	No	2	66.7	10	76.9	3	60.0	2	22.2	0	0.0
Herniation	Yes	2	66.7	7	53.8	4	80.0	7	77.8	13	100.0	0.093
	No	1	33.3	6	46.2	1	20.0	2	22.2	0	0.0
Foraminal compression	Yes	2	66.7	1	7.7	0	0.0	0	0.0	0	0.0	0.001
	No	1	33.3	12	92.3	5	100.0	9	100.0	13	100.0
Thecal Sac compression	Yes	2	66.7	8	61.5	4	80.0	7	77.8	13	100.0	0.19
	No	1	33.3	5	38.5	1	20.0	2	22.2	0	0.0
degenerative spinal canal stenosis	Yes	1	33.3	0	0.0	0	0.0	1	11.1	5	38.5	0.061
	No	2	66.7	13	100.0	5	100.0	8	88.9	8	61.5
Spinal cord compression	Yes	1	33.3	0	0.0	0	0.0	1	11.1	4	30.8	0.14
	No	2	66.7	13	100.0	5	100.0	8	88.9	9	69.2