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Table 1 A summary of general surgical operating list characteristics in the DS and MT departments between 1997 & 2004.

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

Operating list factors Day Surgery (DS) Main Theatres (MT)
Operating list volume   
   Mean list-score in units per hour (SD) 70.3(26.0) 86.86 (38.29)
Session factors   
   Session type   
Percentage of operations performed on Morning lists (n) 38.2%(3226) 15.9%(1156)
Percentage of operations performed on Afternoon lists (n) 61.1%(5083) 17.4%(1265)
Percentage of operations performed on 'All-day' lists (n) - 66.8%(4862)
   No. of theatre suites 5 10
Personnel factors   
   Surgeons   
Total number of surgeons coded on database 133 125
No. of surgeons with >100 operative procedures 16 16
Percentage of total cases performed by surgeons with>100 cases (n) 79.3% (6594) 78.7% (5732)
   Anaesthetists   
Total no. of Anaesthetists' coded on database 246 238
No. of anaesthetists with >100 operative procedures 10 14
Percentage of total cases performed by anaesthetists with>100 cases (n) 23. 9% (1983) 65. 6%(5290)
List factors   
   Overruns   
Overrunning operating lists (%) 627/2092 (30.0%) 1079/3234 (33.3%)
Median list overrun (Q1-Q3,n) in minutes 50 (24 – 84, n = 627) -
Median list overrun (Q1-Q3,n) as a percentage of session duration (%) - 13.1(5.5–26.2, n = 1079)
Number.(%) of MT lists where no overrun occurred - 2262 (69.9%)
Number(%) of MT lists where overrun : session length = 0–0.1 - 403 (12.5%)
Number(%) of MT lists where overrun : session length = 0.11–0.2 - 215 (6.6%)
Number(%) of MT lists where overrun : session length = 0.21–0.3 - 150 (4.6%)
Number(%) of MT lists where overrun : session length >0.31 - 204 (6.3%)
   Late-starts   
Median (Q1-Q3, n) late-start in minutes 32 (17–48, 2087) 65 (41–90, 3229)
%(n). DSC operations on lists where Late start <30 minutes 996 (47.61%) -
%(n). DSC operations on lists where Late start is 30–60 minutes 870 (41.59%) -
%(n). DSC operations on lists where Late start is > 60 minutes 221 (10.56%) -
Number (%) of MT lists where no Late-start occurred - 103 (3.18%)
Number(%) of MT lists where Late-start: session length = 0–0.1 - 730 (22.57%)
Number(%) of MT lists where Late-start : session length = 0.11–0.2 - 1564 (48.36%)
Number(%) of MT lists where Late-start : session length = 0.21–0.3 - 522 (16.14%)
Number(%) of MT lists where Late-start : session length > 0.31 - 315 (9.74%)