Table 3.

Variation in theatre and ward capacity across cardiac surgery units.

Capacity	Units reporting	Overalla	Variation across units
			Median	IQR	Range
Cardiothoracic theatres (n):	16	68	4	3, 5	2, 7
Cardiac	16	32	2	0, 3.5	0, 5
Thoracic	16	11	0	0, 1.5	0, 2
Mixed	16	25	1	0, 3	0, 4
Surgical beds (n):	16	699.6	43	30, 56	20, 74
Cardiac	8	244.6	32	23.5, 36.8	20, 40
Thoracic	8	179	23	16.5, 25	16, 34
Mixed	8	276	30	26.5, 43.5	20, 56
Critical care beds allocated to cardiothoracic surgery (n)b	16	314	17	16, 26	10, 32
Bed occupancy (%)c	9		84	81, 85	75, 100

^aThe number reported is the average over the three years of the study.

^b Includes both level 3 (intensive care) and level 2 (high dependency) beds.

^c Based on number of nights spent on critical care unit.

IQR, interquartile range.