Table 5.

Subgroup multivariate analysis.

Factors	Age < 40 years				Age ≥ 40 years
	OR	95% Wald CL		P-value	OR	95% Wald CL		P-value
Body mass index	0.981	0.894	1.075	0.6772	1.066	0.973	1.169	0.1703
Systolic blood pressure	1.046	0.992	1.103	0.0974	1.052	0.999	1.108	0.0554
Diastolic blood pressure	0.982	0.895	1.077	0.6952	0.995	0.917	1.080	0.8997
Gender (ref = female)	3.010	0.105	86.567	0.5203	0.228	0.040	1.314	0.0981
Degenerative joint disease	0.486	0.077	3.085	0.4444	0.666	0.197	2.251	0.5126
Hypercholesterolemia	1.979	0.178	22.029	0.5787	4.335	0.930	20.202	0.0618
Obstructive sleep apnea	4.482	0.956	21.003	0.0570	0.605	0.160	2.291	0.4598
Diabetes mellitus	3.112	0.299	32.337	0.3419	8.263	1.725	39.586	0.0082

OR = Odds Ratio; C.I. = Confidence Interval.; Logistic Regression Analysis to obtain OR.