Table 3

Evaluation of the measurement model

Construct	Item	Convergent validity			Internal consistency reliability		Discriminant validity
		Loadings	Indicator reliability	AVE	Composite reliability	Cronbach’s alpha	HTMT ratio below 0.90
		> 0.708	> 0.50	> 0.50	> 0.70	0.60–0.95	HTMT ratio below 0.90
BI	BI1	0.872	0.760	0.835	0.938	0.901	Yes
	BI2	0.938	0.880
	BI3	0.929	0.863
EE	EE1	0.899	0.808	0.773	0.931	0.902	Yes
	EE2	0.909	0.826
	EE3	0.901	0.812
	EE4	0.804	0.646
FC	FC1	0.776	0.602	0.525	0.812	0.695	Yes
	FC2	0.757	0.573
	FC3	0.809	0.654
	FC4	0.521	0.271
HM	HM1	0.891	0.794	0.705	0.876	0.807	Yes
	HM2	0.899	0.808
	HM3	0.716	0.513
HT	HT1	0.798	0.637	0.561	0.792	0.628	Yes
	HT2	0.672	0.452
	HT3	0.771	0.594
PDT	PDT2	0.876	0.767	0.844	0.915	0.817	Yes
PDT	PDT3	0.936	0.876	0.844	0.915	0.817	Yes
PE	PE1	0.789	0.623	0.666	0.888	0.833	Yes
	PE2	0.801	0.642
	PE3	0.835	0.697
	PE4	0.838	0.702
PV	PV1	0.663	0.440	0.706	0.876	0.789	Yes
	PV2	0.910	0.828
	PV3	0.922	0.850
SI	SI1	0.875	0.766	0.768	0.909	0.850	Yes
	SI2	0.887	0.787
	SI3	0.867	0.752
TR	TR1	0.788	0.621	0.662	0.887	0.830	Yes
	TR2	0.784	0.615
	TR3	0.817	0.667
	TR4	0.864	0.746

BI, behavioural intention; EE, effort expectancy; FC, facilitating conditions; HM, hedonic motivation; HT, habit; PDT, perceived disease threat; PE, performance expectancy; PV, price value; SI, social influence; TR, trust.