 Data was collected on consecutive patients 18 years with a hospital length of stay of 48 hours admitted to the cardiology, pulmonary, or general medical services. Admission dates were a sample of two different two-week blocks January 1-14, 2006 and April 1-14, 2006. These blocks were chosen to be consistent with dates of analysis in the pre-intervention cohort. Patients receiving therapeutic anticoagulation were excluded. 