Table 4. Definitions of times extrapolated from the ORMIS data recorded during the audit period.

Definition of Times	Explanation of Times
Sessional time (ST)	All time within the allocated elective operating session excluding OT + ES time
Early start time (ES)	Scheduled start of ST – T1
Late start time (LS)	T1 - scheduled start time of ST
Anaesthetic Time (AT)	(T2 – T1) + (T4 – T3)
Changeover Time (CT)	T1 (next patient) – T4 (previous patient)
Procedure Time (PT)	T3 – T2
Overtime (OT)	PT + AT occurring after end of ST
Non-operative Time (NOT)	AT + CT