What is average length of stay (ALOS)?
average length of stay (ALOS) is A measure of how many days a patient, on average, spends in the hospital. Hence, this measure, when applied to individuals or specific groups of patients, may be an indicator of the severity of illness and resource use. It is often used as a comparison to assess efficiency of resource usage between hospitals.
source: A GLOSSARY OF TERMS FOR COMMUNITY HEALTH CARE AND SERVICES FOR OLDER PERSONS. World Health Organization, 2004.