THEATRE CASES are classified by whether the visit to the OPERATING THEATRE occurred 'during' or 'outside' a scheduled session. A THEATRE CASE is considered 'during' if it was carried out during a period of time allocated to a scheduled OPERATING THEATRE SESSION and by a member of a consultant firm of the same specialty as that allocated to the session. Note that a scheduled OPERATING THEATRE SESSION may overrun. (See definition of OPERATING THEATRE SESSION).

A THEATRE CASE is 'outside' a scheduled OPERATING THEATRE SESSION if it is not 'during'. 

This attribute is also known by these names:

Context	Alias
plural	SCHEDULED SESSIONS DURING OR OUTSIDE