4 ORs | | Standard | Standard-Log | Monte Carlo |
|---|
Emergent | Mean | 16 | 9 | 11 |
Urgent1 | Mean | 23 | 12 | 15 |
Urgent2 | Mean | 38 | 18 | 23 |
Urgent3 | Mean | 61 | 26 | 34 |
Utilization (%) | | 55.9 | 47.9 | 54.7 |
3 ORs | | | | |
Emergent | Mean | 53 | 32 | 37 |
Urgent1 | Mean | 87 | 48 | 54 |
Urgent2 | Mean | 195 | 91 | 114 |
Urgent3 | Mean | 462 | 166 | 226 |
Utilization (%) | | 74.5 | 63.9 | 73.3 |
- The standard approach and Monte Carlo simulation used four (top) or three (bottom) operating rooms (ORs). Because the standard approach we used accepts a maximum of four urgency classes, we combined the 0–24 h urgency class with the add-on elective class for both Monte Carlo simulation and the standard approach. In the first column the surgical time was based on the mean of the actual surgical times of urgent cases for 1 year at our institution (plus 60 min preparation and clean-up time; total 244.76 min). The second column (Standard-Log) is based on a log transformation of the actual times (plus 60 min preparation and clean-up time; total 210 min). Note that the Monte Carlo simulation produced results closer to the log-transformed data. The standard approach produces mean values, but no variances because it is formulaic-based. The Monte Carlo data are from one simulation run, although the expected variation can be seen from the variation in the data of Table 2
