Table 4.

Comparison of observed VTE rates at stratified risk levels between the 2005 and 2010 Caprini Risk Assessment Models. P values compare observed rates of VTE at individual risk levels using the 2005 and 2010 Caprini RAM.

	2005 Caprini Model		2010 Caprini Model		p value
Risk Level	Patients without VTE	Patients with VTE (%)	Patients without VTE	Patients with VTE (%)
Caprini 1-2	0	0	137	1 (0.72%)	---
Caprini 3-4	1429	6 (0.42%)	698	3 (0.43%)	0.974
Caprini 5-6	1143	14 (1.21%)	929	11 (1.17%)	0.933
Caprini 7-8	525	10 (1.87%)	908	11 (1.20%)	0.300
Caprini >8	193	12 (5.85%)	618	16 (2.52%)	0.021