Table 1.

Year	2005	2006	2007	2008	2008 versus 2005–7
Proximal DVT incidence (cases detected)	1.8% (182)	2.0% (204)	1.7% (173)	1.1% (128)	P < .001
Age range	20–99	17–83	18–100	18–98	NS
Male : female ratio	1 : 1.2	1 : 1.36	1 : 1	1 : 1.4	NS