Table 5.

Multivariate analysis for risk factors of symptomatic DVT

Variable	p	HR	95%CI
Age≧75 yr	0.010	2.396	(1.227-4.677)
Male Gender	0.041	0.353	(0.130-0.957)
Risk factors	0.760	1.114	(0.556-2.233)
TKA/THA	0.074	1.792	(0.944-3.401)
Seroconvertion of IgG-class HIT Ab	0.005	2.583	(1.338-4.984)

Abbreviations: DVT; deep vein thrombosis, TKA; total knee arthroplasty, THA; total hip arthroplasty, HR; Hazard Ratio, CI; Confidence Interval