Figure 1

Selection of study population and reasons for exclusion. Abbreviations: VTE = venous thromboembolism * On basis of hospital enrolment forms ^† On basis of patient enrolment logs, includes patients who did not meet protocol requirements (eg., age, type of condition, or missing hospital chart) ^‡ Includes patients in general surgical units, surgical intensive care units, neurosurgery, gynecology and orthopedics ^§ Includes patients in other eligible wards.