Table 2.

Incremental fit of the hierarchical logistic regression models.

Outcome	Block	Δχ2 (df)	p value	Nagelkerke R2	ΔR2
COVID-19	1	244.04 (29)	<0.001	0.127	–
	2	191.34 (15)	<0.001	0.220	0.093
	3	339.19 (3)	<0.001	0.371	0.151
	4	37.32 (1)	<0.001	0.387	0.016
Influenza	1	257.00 (29)	<0.001	0.115	–
	2	186.67 (15)	<0.001	0.193	0.078
	3	428.84 (3)	<0.001	0.354	0.161
	4	108.70 (2)	<0.001	0.392	0.038

Block 1: sociodemographic, health-related, use of physician services and health-literacy variables; Block 2: political preference, religious practice, social media use and conspiracy mentality; Block 3: COM-B Capability, Opportunity and Motivation; Block 4: mean-centered vaccine hesitancy for COVID-19 and mean-centered linear plus squared vaccine hesitancy terms for influenza. ΔR² denotes the change in Nagelkerke R² from the preceding block.