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Table 1 Descriptive statistics, total population and the two main patient groups

From: Impact of changed management policies on operating room efficiency

Population Variable Period 1 Period 2 Change, %
Total Number of days (n) 315 316  
  Number of patients (n) 11 372 12 143 6.8*
  Case time (hours) 23 532 25 202 7.1*
  Out-hours operating (hours) 5 236 5 400 3.2
Elective Number of patients (n) 7 709 8 044 4.3*
  Case time (hours) 16 433 16 693 1.6
  Overtime (hours) 494 367 −26*
  SD case time per day 1 509 1 227  
  Number of operating rooms (n) 17 14  
Non - elective Number of patients (n) 3 663 4 099 12*
  Case time (hours) 7 099 8 509 20*
  Case time day (hours) 2 534 3 763 48.5*
  Case time evening (hours) 2 156 2 337 8.4*
  Case time night (hours) 582 440 −24.4*
  Case time weekend (hours) 1 827 1 969 7.8
  Day shift, percentage of total case time (%) 36 44  
  Evening shift, percentage of total case time (%) 30 27  
  Night shift, percentage of total case time (%) 8 5  
  Weekend, percentage of total case time (%) 26 23  
  Number of nights without surgery (n) 55 112  
  SD daily case time (dayshift) 352 281  
Total Mean utilization 17 OR s (%) 56 -  
Elective Mean utilization 14 OR s (%) - 60  
Non - elective Mean utilization 3 OR s (%) - 62  
  Mean utilization evening (%) 48 52  
  Mean utilization night (%) 37 28  
  1. Note. *p<0.05. SD = Standard Deviation. Calculations of mean OR utilization on dayshifts include weekdays with elective surgery (n = 221 and 220 in period one and two, respectively). Consequently, a total of 40 hours (period one) and 74 hours (period two) non-elective case time conducted on dayshifts without elective cases is excluded. Mean OR utilization on evenings and nights include all weekdays in the two periods; 225 days and 226 weekdays.