How are 'Total Early Starts' calculated in the Theatre Utilisation Session Details table?

To find the session details table, navigate to Surgery > Theatre Effectiveness > Utilisation and select the 'Session Details' button. 'Total Early Starts ' is Column AA.

"Total Early Starts" refers to the total Minutes the patient enters the theatre prior to session commencement time.

This is not included in the total utilisation (column Y) as it is above the allocated session minutes.