A Multiobjective Model for a Multilevel Blood Supply Chain to Improve the Attractiveness of Blood Centers during the COVID-19 Pandemic

Table 2

Specifications of the samples.

Indicators	Sample instance number
	1	2	3	4	5	6	7	8	9	10
Ordinary donor group	2	4	6	8	10	14	16	18	19	20
Improved donor group	2	4	6	8	10	14	16	18	15	18
Temporary facilities	3	5	7	9	11	8	7	9	7	8
Local centers	4	6	8	10	12	9	8	10	12	10
Regional centers	4	6	8	10	12	9	8	10	9	14
Hospitals	2	4	6	8	10	8	7	10	12	15
Blood product	5	5	5	5	5	5	5	5	5	5
Life of each product	5	5	5	5	5	5	5	5	5	5
Blood collection method	2	2	2	2	2	2	2	2	2	2
Period	1	1	2	2	1	3	2	2	2	1
Corona status scenarios	1	2	2	2	2	2	3	1	2	2