“…We also collected information on body mass index (BMI) -calculated from height and weight as reported by the patient -and smoking status, which may be correlated with a longer hospitalization as it is associated with medical complications. 19,20 Injury severity characteristics included isolated trauma or polytrauma, upper limb involvement, open or closed fracture, trauma associated with head injury, surgical versus conservative treatment, trauma above or below the knee, time between injury and hospital admission and time between admission and surgery. Socioeconomic status was characterized by employment status (unemployed, employed, retired, autonomous worker, student, other), marital status (married, divorced, single, widower) and patient insurance (none, provincial automobile insurance plan, workers compensation, private insurance).…”