Table 4. Potential risk factors of VTE for patients with osteoarthritis with multivariate cox regression analyses.

Demographic data	Patients (No)	VTE (n,%)	B	SE	Wald	Sig	Exp (B)
Age<60y	180	23 (12.8%)	-0.121	0.147	2.114	0.125	0.730
Age>60y	914	147 (16.1%)
Female	573	90 (15.7%)	-0.221	0.236	0.706	0.347	0.630
Male	521	70 (13.4%)
BMI<25kg/m2	443	60 (21.1%)	0.169	0.632	0.864	0.461	0.944
BMI>25kg/m2	651	7 (29.1%)