Table 3.

Hierarchical regression model of factors associated with intention to receive COVID-19 vaccines.

Variable	Intention to Vaccinate
	Model 1	Model 2	Model 3	Model 4
	OR (95% CI)	OR (95% CI)	OR (95% CI)	OR (95% CI)
Demographic factors
Gender (ref. Female)
Male	1.53 *** (1.20–1.95)	1.46 ** (1.12–1.90)	1.48 ** (1.12–1.95)	1.53 ** (1.14–2.07)
Age	1.03 *** (1.02–1.04)	1.02 *** (1.01–1.03)	1.02 ** (1.01–1.03)	1.02 ** (1.00–1.03)
Education (ref. Diploma/University degree/Postgraduate degree)
Primary/Lower secondary	1.29 (0.85–1.96)	1.66 * (1.05–2.62)	1.38 (0.85–2.23)	1.25 (0.75–2.10)
Upper secondary	1.19 (0.86–1.65)	1.35 (0.94–1.93)	1.37 (0.94–1.99)	1.24 (0.83–1.86)
Economic activity (Non-working)
Working	0.71 * (0.54–0.94)	0.65 ** (0.48–0.87)	0.63 ** (0.46–0.86)	0.63 ** (0.45–0.87)
Health Belief Model factors
Perceived susceptibility (ref. Not susceptible)		3.01 *** (2.09–4.34)	2.85 *** (1.94–4.19)	2.41 *** (1.60–3.64)
Perceived severity		1.09 (0.94–1.26)	0.98 (0.83–1.15)	1.03 (0.86–1.22)
Perceived benefits		1.32 ** (1.11–1.58)	1.35 ** (1.12–1.63)	1.18 (0.97–1.44)
Perceived barriers (reversed)		1.66 *** (1.40–1.97)	1.38 ** (1.14–1.68)	1.18 (0.96–1.46)
Self efficacy		1.20 * (1.02–1.40)	1.15 (0.97–1.36)	1.22 * (1.02–1.47)
Cues to action		1.55 *** (1.31–1.84)	1.64 *** (1.36–1.96)	1.31 ** (1.07–1.60)
Acceptance of governmental measures related to COVID-19		1.21 * (1.01–1.45)	1.32 ** (1.08–1.60)	1.24 * (1.01–1.53)
COVID-19 specific factors
Concern about COVID-19			1.20 * (1.02–1.41)	1.13 (0.95–1.34)
Experience of COVID-19			0.93 (0.76–1.13)	1.05 (0.85–1.31)
Past experience of other pandemics			1.72 *** (1.39–2.13)	1.46 *** (1.17–1.83)
Concern about the safety of COVID-19 vaccines			0.61 *** (0.53–0.70)	0.61 *** (0.52–0.71)
Knowledge about COVID-19			0.88 (0.75–1.03)	0.78 ** (0.66–0.93)
Trust in authorities				2.88 *** (2.38–3.50)
Model statistics
Cox and Snell R2	0.082	0.212	0.274	0.351
Nagelkerke R	0.111	0.285	0.369	0.472

Note. * p < 0.05. ** p < 0.01. *** p < 0.001.