Table 2.

Risk factor analysis of DVT during hospitalization determined by multivariate logistic regression.

Group	β value	OR	95% CI	P value
Age	0.035	1.035	1.013-1.059	0.002
Sex	0.442	1.556	0.889-2.723	0.121
Types of fracture	0.239	1.271	0.822-1.964	0.281
Hypertension	0.328	1.388	0.742-2.594	0.305
Coronary heart disease	-0.060	0.942	0.498-1.784	0.855
ASA	0.074	1.077	0.656-1.768	0.771
D-dimer at one day after operation	0.063	1.065	1.030-1.102	<0.001
D-dimer at one month after operation	0.095	1.100	0.989-1.223	0.079