 Using a data abstraction form, we gather the following information: 1 patient demographics, 2 identity of the attending, resident, and interns caring for the patient, 3 whether the patient had any absolute or relative contraindications for receiving LMWH, as delineated by the DVT critical pathway, including insurance status and 4how the patient was treated for hisher condition. To examine whether the identity of the primary care physician affects whether LMWH is given, we also collect the name of the primary care physician if it is listed on the chart. 