Table 4.

Hierarchical linear regression of study variables.

	Model 1	Model 2	Model 3	Model 4
Attitude	0.361*	0.167*	0.093**	0.083**
Subjective norms		0.474*	0.372*	0.358*
Perceived behavioral control			0.259*	0.247*
Gender (vs. female)
Male				−0.034
Year of education (vs. first-year students)
Second-year student				−0.017
Third-year student				−0.034
Having family relatives work in the health sector (vs. no)
Yes				0.015
Family's residence (vs. urban)
Rural areas				0.005
Living with (vs. parents/relative)
Other				0.048
Elderly people in the family (vs. no)
Yes				0.019
Sources of knowledge about COVID-19
Ministry of health (vs. no)
Yes				0.146*
University (vs. no)
Yes				0.005
Relatives/friends (vs. no)
Yes				−0.020
Community (vs. no)
Yes				0.114*
Others (vs. No)
Yes				0.063
R2	0.129	0.315	0.359	0.370
p	<0.001	<0.001	<0.001	<0.001
F	88.93	137.93	112.16	23.99

^**p < 0.01,

^*p < 0.05; Standardized coefficients are presented.