Appendix 5. Multivariate logistic regression demonstrating factors associated with willingness to pay for Sputnik V (included all independent variables)

Variables		Willing to pay for Sputnik V vaccine	aOR* (95%CI)	p-value
Residence
	Urban area	857 (69.3)
	Rural area	608 (70.9)	1.066 (0.867 - 1.312)	0.544
Age (year)
	From 18 to 29	821 (68.7)
	From 30 to 39	388 (72.0)	0.922 (0.638 - 1.332)	0.666
	From 40 to 49	197 (70.6)	0.893 (0.570 - 1.397)	0.619
	50 and above	59 (73.8)	1.116 (0.588 - 2.118)	0.736
Ethnicity
	Kinh	1157 (69.5)
	Other	308 (72.0)	1.103 (0.861 - 1.414)	0.437
Sex
	Male	440 (72.4)
	Female	1025 (69.0)	0.867 (0.694 - 1.083)	0.208
Occupation
	Health staff	307 (77.9)
	Worker	68 (67.3)	0.646 (0.385 - 1.086)	0.099
	Other governmental staff	325 (70.2)	0.668 (0.481 - 0.929)	0.016
	Student	564 (69.3)	0.846 (0.583 - 1.229)	0.381
	Own business	50 (68.5)	0.812 (0.456 - 1.448)	0.481
	Others	151 (60.9)	0.550 (0.377 - 0.801)	0.002
Education
	High school or lower	289 (67.2)
	Above	1176 (70.7)	1.029 (0.796 - 1.332)	0.825
Marital status
	Single	751 (67.9)
	Married	669 (72.4)	1.272 (0.875 - 1.848)	0.208
	Divorced/ Widowed	45 (71.4)	1.318 (0.686 - 2.533)	0.408
Family size
	One	49 (67.1)
	Two	60 (65.9)	0.922 (0.470 - 1.808)	0.812
	From three people	1356 (70.3)	1.089 (0.642 - 1.848)	0.751
Family economic status
	Poor/near poor	56 (55.4)
	Others (average, high income)	1409 (70.7)	1.689 (1.099 - 2.596)	0.017
Chronic disease
	No	1384 (70.3)
	Yes	81 (65.3)	0.716 (0.476 - 1.079)	0.110
Allergy
	Yes	405 (68.3)
	No	898 (71.8)	1.117 (0.897 - 1.392)	0.323
	Do not know/remember	162 (65.1)	0.910 (0.659 - 1.256)	0.565
Occupational changes due to COVID-19
	Yes	339 (61.9)
	No	1126 (72.9)	1.416 (1.109 - 1.808)	0.005
Income reduction due to COVID-19
	Yes	508 (65.3)
	No	957 (72.8)	1.189 (0.946 - 1.494)	0.137
F Current contact level*
	F1, F2	49 (62.8)
	F3, F4	168 (70.6)	1.144 (0.646 - 2.027)	0.644
	None	1248 (70.2)	1.143 (0.690 - 1.893)	0.604
Previous three waves contact (F1 to F4)*
	Yes	139 (69.8)
	No	1326 (70.0)	1.016 (0.730 - 1.414)	0.927
Feeling of being at risk of COVID-19 infection in the near future
	Yes	385 (73.1)
	No	304 (68.6)	0.809 (0.603 - 1.085)	0.156
	Do not know	776 (69.1)	0.873 (0.686 - 1.112)	0.272

aOR: Adjusted Odd Ratio