Development and Internal Validation of a Prediction Model for In-Hospital Mortality in Geriatric Patients With a Hip Fracture

OBJECTIVE: To develop and validate a prediction model for in-hospital mortality in patients with hip fracture 85 years of age or older undergoing surgery. DESIGN: A multicenter prospective cohort study. SETTING: Six Dutch trauma centers, level 2 and 3. PARTICIPANTS: Patients with hip fracture 85 years of age or older undergoing surgery. INTERVENTION: Hip fracture surgery. MAIN OUTCOME MEASUREMENTS: In-hospital mortality. RESULTS: The development cohort consisted of 1014 patients. In-hospital mortality was 4%. Age, male sex, American Society of Anesthesiologists classification, and hemoglobin levels at presentation were independent predictors of in-hospital mortality. The bootstrap adjusted performance showed good discrimination with a c-statistic of 0.77. CONCLUSION: Age, male sex, higher American Society of Anesthesiologists classification, and lower hemoglobin levels at presentation are robust independent predictors of in-hospital mortality in patients with geriatric hip fracture and were incorporated in a simple prediction model with good accuracy and no lack of fit. LEVEL OF EVIDENCE: Prognostic Level II. See Instructions for Authors for a complete description of levels of evidence.