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. 2022 May 11;10(5):758. doi: 10.3390/vaccines10050758

Table 6.

Hierarchical multiple regression (HRM) predicting the intention of COVID-19 booster dose acceptability among hesitant respondents (n = 209).

Variables Model 1 Model 2 Model 3 Model 4 Model 5
B β B β B β B β B β
Constant 1.821 * - −0.087 - 0.391 - −0.089 - 0.175 -
Age −0.012 −0.125 −0.011 −0.144 −0.007 −0.095 0.001 0.007 −0.001 −0.014
Gender (Ref: Female) 0.102 0.037 0.181 0.065 0.167 0.060 0.117 0.042 0.088 0.031
Non-Hispanic African American (Ref: White) 0.174 0.037 0.143 0.031 0.225 0.048 0.004 0.001 −0.029 −0.006
Hispanic 0.361 0.105 0.260 0.076 0.365 0.107 0.215 0.063 0.236 0.069
Other 0.139 0.028 −0.051 −0.01 −0.097 −0.02 −0.068 −0.014 −0.05 −0.01
USD 10.001–USD 25,000 (Ref: Income under USD 10,000) 0.81 * 0.225 0.42 0.118 0.34 0.094 0.207 0.058 0.2 0.056
USD 25,001–USD 50,000 0.42 0.138 0.27 0.090 0.24 0.077 0.111 0.036 0.132 0.043
USD 50,001–USD 100,000 0.33 0.103 0.12 0.039 0.21 0.065 0.012 0.004 0.019 0.006
Above USD 100,000 0.70 0.128 0.35 0.064 0.44 0.080 0.047 0.009 0.024 0.004
Married (Ref: Divorced/Separated) −0.098 −0.035 −0.175 −0.063 −0.184 −0.066 0.114 0.041 0.153 0.055
Single −0.063 −0.021 −0.016 −0.005 −0.05 −0.017 0.169 0.057 0.205 0.069
Other 0.125 0.026 0.155 0.033 0.215 0.045 0.339 0.071 0.349 0.073
Suburban (Ref: Rural) 0.285 0.100 0.241 0.085 0.210 0.074 0.220 0.077 0.137 0.048
Urban 0.413 0.138 0.336 0.112 0.274 0.091 0.244 0.081 0.197 0.066
Republicans (Ref: Democrats) −0.547 * −0.184 −0.276 −0.093 −0.177 −0.060 −0.246 −0.083 −0.262 −0.088
Other, including independent −0.872 ** −0.312 −0.570 * −0.204 −0.401 −0.144 −0.406 * −0.145 −0.431 * −0.154
Christianity (Ref: Religiously unaffiliated) 0.778 * 0.270 0.610 * 0.212 0.558 * 0.193 0.210 0.073 0.189 0.065
Others 0.430 0.134 0.490 0.152 0.486 0.151 0.140 0.043 −0.433 * −0.155
West (Ref: South) 0.019 0.004 0.060 0.014 0.001 0.003 0.071 0.017 0.095 0.022
Northeast 0.263 0.074 0.045 0.013 0.006 0.002 0.054 0.015 0.046 0.012
Midwest −0.049 −0.014 −0.082 −0.024 −0.089 −0.026 −0.027 −0.008 0.004 0.001
Some college (Ref: Some high school) −0.414 −0.137 −0.314 −0.104 −0.133 −0.044 −0.057 −0.019 −0.051 −0.017
High school diploma or GED −0.075 −0.025 −0.248 −0.081 −0.149 −0.049 −0.184 −0.058 −0.202 −0.066
4 years of a college degree −0.342 −0.103 −0.260 −0.079 −0.137 −0.041 −0.266 −0.080 −0.260 −0.078
Graduate 0.292 0.060 −0.023 −0.005 0.011 0.002 −0.114 −0.023 −0.110 −0.023
Others −0.774 −0.102 −0.732 −0.096 −0.382 −0.050 −0.245 −0.033 −0.184 −0.024
Primarily vaccinated (Ref: No) - - 0.999 ** 0.359 0.756 ** 0.271 0.511 * 0.183 0.420 * 0.150
Vaccine Literacy - - 0.024 0.111 0.026 * 0.117 0.001 0.002 −0.008 −0.036
Vaccine Confidence - - 0.522 * 0.207 0.039 0.016 0.198 0.079 0.222 0.088
Participatory dialogue - - - - 0.109 ** 0.377 0.037 0.130 0.031 0.108
Behavioral confidence - - - - - - 0.202 ** 0.548 0.170 ** 0.461
Changes in the physical environment - - - - - - - - 0.059 * 0.172
R2 0.233 - 0.433 - 0.496 - 0.670 - 0.684 -
F 2.257 * - 4.958 ** - 6.127 ** - 12.136 ** - 12.411 ** -
Δ R2 0.233 - 0.200 - 0.063 - 0.174 - 0.014 -
Δ F 2.257 * - 20.605 ** - 21.785 ** - 91.327 ** - 7.387 *

* p-value < 0.05; ** p-value < 0.001; Adjusted R2 of initiation in the final model = 0.629.