Correlation between Kellgren-Lawrence classification of osteoarthritis and Knee Injury and Osteoarthritis Outcome Score

Table 5 Logistic regression to predict factors related to severe Knee Injury and Osteoarthritis Outcome Score (< 40)

	Predictor variable	Odds ratio	95%CI	P value
Age	19-29	1.38	0.45-4.20	0.769
	40-49	1.94	0.88-4.28	0.574
	50-59	2.43	1.15-5.12	< 0.001
	≥ 60	1.81	0.79-3.09	0.122
	≤ 18	Reference
Gender	Female	1.04	1.03-2.95	0.339
	Male	Reference
Body mass index	Underweight	2.16	0.29-15.91	0.455
	Overweight	1.36	0.65-2.87	0.415
	Obese	2.79	1.41-5.51	0.003
	Normal	Reference
Kellgren-Lawrence grading	Grade 2	2.11	0.85-5.27	0.107
	Grade 3	4.32	1.73-10.78	0.002
	Grade 4	7.88	3.10-20.04	< 0.001
	Grade 1	Reference