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Table 3 Multiple regression analysis model and list utilization in Main Theatres (only reference categories and retained model variables listed).

From: Is theatre utilization a valid performance indicator for NHS operating theatres?

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