Table 4. Risk factors for osteoarthritis in this population.

Variable	P	OR	OR (95.0% CI)
HDL-C (normal-controlled)	0.044
Normal
Lower	0.012	4.584	1.389–15.125
Hypertension (normal-controlled)	0.026
Normal
Stage 1	0.122	0.376	0.108–1.301
Stage 2	0.576	1.457	0.401–5.285
Stage 3	0.058	6.749	0.936–48.668
The number of metabolic disorders	0.001
0
1	0.979	1.020	0.222–4.700
2	0.008	8.011	1.705–37.638
3	0.000	63.895	6.351–642.865
4	0.008	57.407	2.932–1,123.913

Within this population lower HDL-C, hypertension and an increasing number of metabolic disorders were positive risk factors for osteoarthritis. P, P value; OR, odds ratio; CI, confidence interval; HDL-C, high density lipoprotein cholesterol.