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Table 2 Descriptive statistics, non-elective patient categories

From: Impact of changed management policies on operating room efficiency

Population Variable Period 1 Period 2 Change, % Diff. (P2-P1)
U1 Number of patients (n) 2276 1448 −36*  
  Case time (hours) 4235 2726 −36*  
  Number of days with surgery 314 308   
  Percentage of patients treated within MAWT (%) 63 76   
  Median waiting time (hours) 3.2 1.7   −1.5*
U2 Number of patients (n) 609 1171 92*  
  Case time (hours) 1106 2171 96*  
  Number of days with surgery 249 296   
  Percentage of patients treated within MAWT (%) 97 93   
  Median waiting time (hours) 4 5   1*
U3 Number of patients (n) 778 1480 90*  
  Case time (hours) 1758 3612 105*  
  Number of days with surgery 261 308   
  Percentage of patients treated within MAWT (%) 70 89   
  Median waiting time (hours) 35 23   −12*
  1. Note. *p<0.05. Diff. = Difference (period 2 - period 1); MAWT = maximum acceptable waiting time; Changes in waiting time between the two periods are compared using the Mann–Whitney U-test. It should be noted that waiting times analysis use disaggregate (patient level) data, while case times analysis use data aggregate per day (i.e.one observation corresponds to one day).Medians are reported because the distributions are skewed by cases with excessive waiting, resulting in mean waiting time being profoundly affected.