Table 6: Risk (odds ratio) between potential risk factors for MRI-detected knee cartilage lesions and self-reported knee complaints within the previous 12 months among 92 male danish floor layers and 49 male danish graphic designers.

	Model 1 (mutually adjusted)			Model 2 (mutually adjusted)			Model 3 (mutually adjusted)			Model 4 (mutually adjusted)
Exposure Variable	Odds Ratio	95% CI^1	P	Odds Ratio	95% CI^1	P	Odds Ratio	95% CI^1	P	Odds Ratio	95% CI^1	P
MRI-detected severe knee cartilage lesions in either knee
Yes	2.49	(1.22; 5.08)	0.0119	2.42	(1.18; 4.96)	0.0163	2.43	(1.17; 5.04)	0.0170	2.44	(1.17; 5.08)	0.0170
No	1	-		1	-		1	-		1	-
Occupation
Floor layer	1.02	(0.49; 2.11)	0.96	1.03	(0.49; 2.17)	0.93	1.00^2	(0.47; 2.12)	0.99	1.00^2	(0.45; 2.23)	0.99
Graphic designer	1	-		1	-		1	-		1	-
Age (per 10 years)	0.71	(0.42; 1.21)	0.21	0.68	(0.39; 1.16)	0.16	0.86	(0.47; 1.58)	0.63	0.85	(0.46; 1.56)	0.60
BMI (per 5 kg/m^2)				1.56	(0.98; 2.49)	0.062	1.54	(0.96; 2.47)	0.075	1.54	(0.96; 2.46)	0.075
Floor layer seniority (per 10 years)							0.63	(0.37; 1.05)	0.073	0.63	(0.37; 1.05)	0.074
Earlier knee injuries
Yes										1.50	(0.47; 4.76)	0.49
No										1	-
Participates in knee straining sports
Yes										0.79	(0.38; 1.65)	0.54
No										1	-

¹CI: confidence interval.

²Estimated odds ratio of floor layers of 32-years’ seniority compared to graphic designers.