Purchasing model
Respirator	Control	Low-cost	Sustainable
Scenario A
RR1	2.56	3.06	2.81
RR2	2.43	3.16	2.80
RR3	1.94	2.66	2.30
RR4	1.86	2.74	2.30
DR1	3.78	3.78	3.78
DR2	3.01	3.20	3.11
DR3	2.30	2.83	2.57
Scenario B
RR1	2.84	3.07	2.95
RR2	4.02	3.87	3.94
RR3	2.54	3.02	2.78
RR4	2.28	3.08	2.68
DR1	3.01	2.24	2.63
DR2	2.52	2.21	2.37
DR3	1.78	1.79	1.79
Scenario C
RR1	2.55	3.05	2.80
RR2	2.48	3.18	2.83
RR3	1.91	2.64	2.28
RR4	1.91	2.77	2.34
DR1	3.78	3.78	3.78
DR2	3.00	3.19	3.09
DR3	2.26	2.81	2.54
Scenario D
RR1	2.67	2.98	2.82
RR2	4.13	3.93	4.03
RR3	2.28	2.88	2.58
RR4	2.81	3.35	3.08
DR1	2.81	2.14	2.48
DR2	2.42	2.16	2.29
DR3	1.72	1.76	1.74