Table 1.

Input parameters used in the cost-effectiveness model

Parameters	Value (SE)	References
Transitional probabilities
Probability of COVID-19 infection
Organ transplant patients	0.003 (0.003)a	COLAB and COWARD
Autoimmune disorder patients	0.002 (0.001)
Dialysis patients	0.005 (0.005)
Probability of severe COVID-19 infection
Organ transplant patients	0.049 (0.009)	COLAB and COWARD
Autoimmune disorder patients	0.012 (0.001)
Dialysis patients	0.076 (0.006)
Probability of death from severe COVID-19 infection
Organ transplant patients	0.332 (0.091)	COLAB and COWARD
Autoimmune disorder patients	0.344 (0.037)
Dialysis patients	0.608 (0.043)
Probability of moving from ‘recovered’ to ‘susceptible’	0.026 (0.007)	Assumption
Direct medical costs (THB)
The treatment of mild to moderate COVID-19
Organ transplant patients	100,620 (21,050)	UCS hospitalisation database
Autoimmune disorder patients	105,930 (10,370)
Dialysis patients	123,500 (3260)
The treatment of severe COVID-19
Organ transplant patients	300,600 (87,420)	UCS hospitalization database
Autoimmune disorder patients	280,140 (33,600)
Dialysis patients	251,500 (8360)
Cost of quarantine at designated facilities	15,200 (3790)
Utility
‘Susceptible’	0.818 (0.02)	[14]
‘Infection’	0.693 (0.01)	[14]
‘Severe infection’	0.515 (0.13)	[14]
‘Recovered’	0.818 (0.02)	[14]

SE standard error

^aThe SE is assumed to be equal to the mean in the sensitivity analysis