Table 3.

Structural equation modeling results.

Hypotheses	Paths	Standard regression coefficient	Standard error	p-value
H1	Accessibility of vaccination services → vaccination intention	0.093	0.063	0.072
H2	Social norms →vaccination intention	0.210	0.100	0.004
H3	Perceived usefulness →vaccination intention	0.449	0.105	<0.001
H4	Accessibility of vaccination services → perceived usefulness	0.207	0.042	<0.001
H5	Social norms → perceived usefulness	0.630	0.056	<0.001

*H1: Accessibility of vaccination services is positively related to HZV intentions among middle-aged and older adults; H2: Social norms are positively associated with HZV intentions in middle-aged and older adults; H3: Perceived usefulness is positively related to HZV intentions in middle-aged and older adults; H4: Accessibility of vaccination services is positively related to the perceived usefulness of HZV in middle-aged and older adults; H5: Social norms are positively related to perceived usefulness of HZV in middle-aged and older adults; H6: Perceived usefulness of HZV plays a mediating role in the accessibility of vaccination services and vaccination intention; H7: Perceived usefulness of the HZV plays a mediating role in social norms and vaccination intention.