Analysis of risk factors for postoperative deep vein thrombosis after craniotomy and nomogram model construction

Table 2 Multivariate analysis of the risk factors for deep vein thrombosis

Risk factors	β	Sx	P value	OR	95%CI
					Lower limit	Upper limit
Age	0.062	0.017	< 0.001	1.064	1.029	1.100
D-dimer	1.681	0.375	< 0.001	5.368	2.575	11.190
Infections	1.268	0.476	0.008	3.553	1.397	9.039
Carprini	0.548	0.143	< 0.001	1.731	1.308	2.290
Steroid	0.963	0.397	0.015	2.619	1.203	5.706
Operation time	0.369	0.143	0.010	1.446	1.093	1.914
Transfusion	1.342	0.657	0.041	3.828	1.056	13.873
IPC	-2.370	0.486	< 0.001	0.094	0.036	0.242

The P value and 95% confidence interval of the final included factors were calculated using the binary metalogic regression equation. IPC: Intermittent pneumatic compression.