COVID-19ワクチン接種の促進・阻害要因―第3回追加接種開始後におけるデータからの検討―○工藤 大介1・李 楊2(1東海学院大学，2名古屋大学)
mail: dkudo@tokaigakuin-u.ac.jp, URL: http://dicek.net/Backgrounda. Vaccination may play a role in controlling COVID-19 pandemics, but negative attitudes toward vaccines are as prevalent asthey have been for other vaccines (e.g., influenza, HPV).
b. According to the IPSOS (2020) international survey, Japan ranked 4th highest aversive attitude among the countries
participating in the survey, following Russia and France.
c. Some previous studies focused on the attributes of participants (Tsuchida et al., 2021), and others examined them from theperspective of social class and personality (Murphy et al., 2021), but the total number of such studies is small.
Objectives
a. Based on previous research on reputational risks after the Tohoku Earthquake (Kudo and Nakayachi, 2014), in this study, weconsidered the aversive attitude toward vaccination as overestimation of risk.
b. We focused on risk perception and risk literacy based on the dual process theory (e.g., Stanovich & West, 2001) and its
related theories.
c. Previous studies have examined the impact of these factors (e.g., risk perception of COVID-19/COVID- 19 vaccine, optimism
for COVID-19, risk aversion, knowledge of COVID-19 vaccine, risk literacy) on vaccination (Kudo & Li, 2021a, Kudo & Li,2021b, Kudo, Iwai & Li, 2021).
d. Based on previous studies, this study aims to examine people’s attitudes toward vaccination (COVID-19, influenza, HPV)and the factors that influence them after the start of the third round of additional COVID-19 vaccination.
Methodsa. In February 2022, when the third round of additional COVID-19 vaccination was started, we conducted an online survey of284 Japanese general adults (F = 137, M = 146, O = 1; Mage = 39.40, SDage = 10.13).
b. Independent variables included demographic variables, risk perception of the COVID-19 infection, risk / effectivenessperception of the COVID-19 vaccine, optimism for COVID-19, risk aversion, and risk literacy (Kanazawa et al., 2020).
c. Dependent variable is intention to vaccinate with COVID-19 vaccine.
Results

Risk Perception432*** ***COVID-19FluHPV

1Vaccines
Fig 1. Comparing Risk perception of vaccines
2Main effect: F(2, 560) = 196.56, p < . 001, ηp = .41
COVID-19 > Flu (t(280) = 16.92, p < .001)
HPV > Flu (t(280) = 17.67, p < .001)

Table 1 Results of analysis with generalized linear model
Variables
β95% Lower 95% Upper
Gender-.081+-.171.009
Age.046-.047.139
Education.008-.066.083
Marital Status.094+
-.015
.203
Child/Children-.054-.154.047
Income.027
-.062
.116
Use of public transportation.079*.004.155
Risk perception of COVID-19.100-.019.219
Knowledge of COVID-19 Vaccine.087*.005.169
Risk perception of COVID-19 Vaccine-.502**-.610-.394
Effectiveness perception of COVID-19 Vaccine.281**.178.383
Media contact-.010-.090.069
Optimism for COVID-19-.049
-.168
.070
Risk aversion.005-.076.085
Risk literacy: Zero risk
.040
-.072
.151
Risk literacy: Benefit tradeoff.022-.052.097
Risk literacy: Risk tradeoff.010-.095.115
Risk literacy: Risk paradox.028-.071.128
Risk literacy: Basic knowledge.005-.092.103
Risk literacy: Risk bias-.052-.163.059
R2 = .586**†p < .10, *p < .05, **p < .01

VIF
1.551
1.430
1.156
2.847
2.460
1.308
1.171
2.260
1.210
1.677
1.710
1.318
2.059
1.137
2.217
1.467
1.848
1.815
1.482
2.142

Discussion & Conclusiona. Comparison of risk perception among vaccines showed that the COVID-19 vaccine had a similar level of risk perception asthe HPV vaccine that caused adverse health effects, and remained consistently high more than a year after vaccination wasinitiated (cf. Kudo & Li, 2021a, Kudo & Li, 2021b, Kudo, Iwai & Li, 2021).
b. In the demographic variables, men were more likely to avoid vaccination, while those with children and those who usedpublic transportation more frequently were more likely to promote vaccination.
c. Risk perception of COVID-19 did not directly promote vaccination intention, but risk perception of the vaccine suppressedvaccination intention.
d. The results of the study revealed that vaccination intention increases with knowledge about vaccines and awareness ofvaccine effectiveness, suggesting that promoting information about vaccines and their effectiveness can promote
vaccination.
日本社会心理学会第63回大会 Copyright © 2022 Daisuke Kudo & Yang Li. All rights reserved.