Early prediction of hospital admission for emergency department patients: a comparison between patients younger or older than 70 years.

Objective: The aim of this study was to develop models that predict hospital admission to ED of patients younger and older than 70 and compare their performance.

Methods: Prediction models were derived in a retrospective observational study of all patients≥18 years old visiting the ED of a university hospital during the first 6 months of 2012. Patients were stratified into two age groups (<70 years old and ≥70 years old).