Older people are increasing users of health care globally. Constraints in bed capacity and resources raise important challenges with regards to management of older people with complex needs, which usually require assertive and holistic assessment. It is important, therefore, to identify aged patients most likely to benefit from such frailty-attuned approaches of care. A previous study using national Hospital Episodes Statistics conducted in the United Kingdom (UK) showed that patients aged over 75 years with characteristics of frailty and at risk of adverse health-care outcomes can be identified using routinely collected data (Gilbert T et al., Lancet 2018). This study lead to the development of the Hospital Frailty Risk Score (HFRS), which is based on International Statistical Classification of Diseases and Related Health Problems 10 (ICD-10) diagnosis codes and has the potential to be used in other countries worldwide, using the ICD-10 coding framework, to identify patients at risk of frailty at the hospital and commissioners levels, as well as for database research purposes. This score has successfully been validated in Canada, Australia and Switzerland. The aim of the present study is to evaluate the ability of the HFRS to predict 30-day in-patient mortality of patients aged 75 years and older admitted to French hospitals as an emergency.

Inclusion Criteria:

• age 75 years or over (on the day of the index admission)
• hospitalized as an emergency (i.e. after visit to ED)

Exclusion Criteria:

• none

Patients considered will be all patients aged 75 years and older hospitalized as an emergency over a one year period ranging from January to December 2017.

According to a preliminary extraction, we expect to include approximately one million patients.