International variation in survival after out-of-hospital cardiac arrest: A validation study of the Utstein template.
Published 17 May 2019 The Utstein factors explained 51% of the variation in survival to hospital discharge among multiple large geographically separate EMS agencies. This suggests that quality improvement and public health efforts should continue to target modifiable Utstein factors to improve OHCA survival. Further study is required to identify the reasons for the variation that is incompletely u