Description of the ambulance services participating in the Aus‐<scp>ROC</scp> Australian and New Zealand out‐of‐hospital cardiac arrest Epistry

There is marked variation between ambulance services currently participating in the Aus-ROC Australian and New Zealand OHCA Epistry with respect to workforce characteristics and key variable definitions. This variation between ambulance services might account for a proportion of the regional variation in survival of OHCA.