Table 1.

Predictors of Group Membership

Predictors	Primary Vaccination (v. Unvaccinated)				Boosted (v. Unvaccinated)				Δ
	OR	CI–	CI+	P	OR	CI–	CI+	P
(Constant)	2.62	0.65	10.58	0.177	19.83	5.19	75.76	<0.001	+
Confidence	1.11	0.99	1.26	0.079	1.20	1.06	1.35	0.003
Complacency	0.74	0.66	0.84	<0.001	0.67	0.60	0.76	<0.001	–
Constraints	0.87	0.74	1.01	0.068	0.72	0.62	0.84	<0.001	–
Calculation	1.07	0.99	1.16	0.090	1.03	0.95	1.12	0.436
Collective responsibility	1.31	1.15	1.48	<0.001	1.39	1.23	1.57	<0.001
Compliance	1.12	0.97	1.29	0.133	1.34	1.17	1.54	<0.001	+
Conspiracy beliefs	0.79	0.71	0.87	<0.001	0.61	0.55	0.67	<0.001	–

Results from the multinomial logistic regression (reference group: unvaccinated individuals, N = 2701, Cox and Snell’s R² = 0.61, Nagelkerke’s R² = 0.72). Bold predictors are statistically significant for P < 0.05. CI– and CI+ denote the lower and upper bounds of the 95% confidence interval, respectively. Δ indicates differences in predictors for both outcomes; + (–) indicates significantly more positive (negative) predictors for booster vaccination as compared with primary vaccination (P < 0.05); see online supplement for the respective regression analysis.