Predictors of length of hospital stay among older adults admitted to acute care wards: a multicentre observational study

Background: Reduction in length of hospital stay (LOS) is considered as a potential strategy to optimize resource consumption and reduce health care costs. We analysed predictors of increased LOS among older patients admitted to acute care wards according to type of admission (through the Emergency Room [ER] or elective). Methods: We analysed data of 1123 older patients, aged 65 years or older, consecutively admitted to seven acute care wards. LOS was defined as the number of days from admission to discharge (or death) and categorized according to its median value (10 days). Results: Mean age of participants was 81 ± 7 years and 56% were women. Patients admitted through ER had a shorter LOS compared with those elective (10.4 ± 6.7 vs. 12.0 ± 6.7 days; p 10 days, for patients admitted through ER, were female gender (OR 0.58; 95% C.I. 0.37-0.90), erythrocyte sedimentation rate (OR 1.02; 95% C.I. 1.01-1.03), and excessive polypharmacy (use of ≥ 10 drugs during stay) (OR 3.60; 95% C.I. 1.40-9.25). Predictors for elective patients were chronic alcohol consumption (OR 0.54; 95% C.I. 0.32-0.93), walking speed ≥ 0.8 m/s (OR 0.31; 95% C.I. 0.14-0.72), excessive polypharmacy (OR 4.78; 95% C.I. 1.92-11.90), pressure ulcers (OR 2.60; 95% C.I. 1.01-6.79), cerebrovascular disease (OR 0.49; 95% C.I. 0.24-0.99) and dementia (OR 0.18; 95% C.I. 0.08-0.39). Conclusions: LOS differed between patients admitted through emergency and through elective admission. Demographic and clinical parameters can affect LOS and polypharmacy was the strongest and the only common risk factor in both groups