Table 3.

Multiple regression analysis model and list utilization in Main Theatres (only reference categories and retained model variables listed).

Risk factor	Model coefficient	Beta coefficient	Beta Standard Error	p-value	Charge in R Square	Model R Square
Constant	46.3	-	0.7	<0.01	-	0.621
List volume (list-score units/hour)		0.252	0.007	<0.01	0.334
List factors
Adjusted overruns
No overrun		Ref
Overrun 1 (0–0.1)		17.9	0.6	<0.01	0.051
Overrun 2 (0.11–0.2)		25.2	0.8	<0.01	0.038
Overrun 3 (0.21–0.3)		33.7	1.0	<0.01	0.038
Overrun 4 (>0.31)		54.0	1.0	<0.01	0.118
Adjusted late-starts
No late start		Ref
Late-start 3 (0.21–0.3)		-2.9	0.6	<0.01	0.001
Late-start 4 (>0.31)		-12.0	0.9	<0.01	0.010
Session factors
Session type
AM list		2.8	0.7	<0.01	0.001
All-day list		Ref
Theatre
MT2		Ref
MT3		2.8	0.9	<0.01	0.000
MT6		3.1	0.6	<0.01	0.001
MT8		7.7	3.3	0.02	0.000
MT10		2.3	0.8	<0.01	0.000
Other 'theatres		5.7	0.9	<0.01	0.000
Personnel factors
Surgeon
Surgeon 1		Ref
Surgeon 2		-4.3	1.4	<0.01	0.000
Surgeon 8		-8.1	0.8	<0.01	0.007
Surgeon 9		-4.4	2.1	0.03	0.000
Surgeon 10		-4.1	1.2	<0.01	0.000
Surgeon 12		-5.0	0.9	<0.01	0.000
Surgeon 13		2.5	0.8	<0.01	0.001
Surgeon 14		-4.4	1.3	<0.01	0.000
Surgeon 'Others'		-8.2	0.6	<0.01	0.009
Anaesthetist
Anaesthetist 1		Ref
Anaesthetist 4		-4.8	0.9	<0.01	0.007
Anaesthetist 5		-4.4	1.7	<0.01	0.000
Anaesthetist 6		3.2	0.9	<0.01	0.000
Anaesthetist 8		-4.3	0.9	<0.01	0.003
Anaesthetist 10		6.6	1.1	<0.01	0.000
Anaesthetist 14		-7.9	1.6	<0.01	0.000
Anaesthetist 'Others'		-1.5	0.5	<0.01	0.000