. 2022 May 10:1–31. Online ahead of print. doi: 10.1007/s10479-022-04667-7

Table 9.

The results of the robust optimization model versus the probability of COVID-19 disease in emergency patients

The probability of COVID-19 disease in emergency patients	0.1	0.3	0.6	0.9
Average cost	72,375	73,990	75,980	78,624
Robust objective function	95,644	94,455	102,689	125,041
Average number of elective patients operated in the planning horizon	23.7	21.8	20.6	18.4
$O U I_{o}^{nc}$	38.83	42.373	45.574	64.13
$O U I_{o}^{c}$	42	45.798	58.994	66.21
$O U I P A_{1}^{nc}$	7.1	9.4	12	15
$O U I P A_{2}^{nc}$	8.4	11.5	31.133	40.41
$O U I P A_{1}^{c}$	0.2	6.27	10.31	26.72
$O U I P A_{2}^{c}$	1.9	7	47.14	90.65
$O W S^{nc}$	25.34	54.49	125.24	166.23
$O W S^{c}$	1.26	2.08	52.74	86.92
Number of operating rooms assigned to COVID-19 ward	1	1	2	3
Number of post-anesthesia beds assigned to COVID-19 ward	3	4	16	22
Number of ICU units assigned to COVID-19 ward	2	2	7	11