Beliefs about and confidence in new medical treatments: lessons from COVID-19 vaccines

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN14065615

Enrollment

15000

Registered

2022-10-06

Start date

2022-11-09

Completion date

Unknown

Last updated

2023-01-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Beliefs about and confidence in new medical treatments Not Applicable

Interventions

This study is the final stage of a longitudinal interventional study that began in the first wave in February 2021, when vaccines for COVID-19 were not available to the general public in Japan, follow

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: A non-probability sample of 15,000 respondents through a survey company, Rakuten Insight, Ltd, including participants of the past three survey waves

Exclusion criteria

Exclusion criteria: Respondents who do not give informed consent at the top page of the internet survey

Design outcomes

Primary

Measure	Time frame
1. Self-reported subjective cost of/confidence in vaccination measured using a background characteristics survey when the participant responded to the survey between 01/11/2022 and 15/11/2022 2. Self-reported history of taking up COVID-19 vaccines measured using a background characteristics survey when the participant responded to the survey between 01/11/2022 and 15/11/2022 3. Impact of side effects on beliefs about vaccines, and through them, confidence in vaccination, and how long the change in confidence in vaccination sustains, measured using the results of this background characteristics survey and those implemented in 01/11/2022 and 15/11/2022 4. Marginal means (probability) of wanting to take the next dose of a COVID-19 vaccine, of being confident in vaccination, and of being confident in science, measured when the participant responded to the survey between 01/11/2022 and 15/11/2022	—

Measure

Time frame

1. Self-reported subjective cost of/confidence in vaccination measured using a background characteristics survey when the participant responded to the survey between 01/11/2022 and 15/11/2022 2. Self-reported history of taking up COVID-19 vaccines measured using a background characteristics survey when the participant responded to the survey between 01/11/2022 and 15/11/2022 3. Impact of side effects on beliefs about vaccines, and through them, confidence in vaccination, and how long the change in confidence in vaccination sustains, measured using the results of this background characteristics survey and those implemented in 01/11/2022 and 15/11/2022 4. Marginal means (probability) of wanting to take the next dose of a COVID-19 vaccine, of being confident in vaccination, and of being confident in science, measured when the participant responded to the survey between 01/11/2022 and 15/11/2022

—

Secondary

Measure	Time frame
1. Hypothetical vaccination conditions under which the costs of taking up vaccines vary and respondents’ preferred conditions measured using a fully randomized conjoint experimental design when the participant responded to the survey between 01/11/2022 and 15/11/2022 2. Experiences of “COVID-19 arm” symptoms measured using a background characteristics survey when the participant responded to the survey between 01/11/2022 and 15/11/2022	—

Measure

Time frame

1. Hypothetical vaccination conditions under which the costs of taking up vaccines vary and respondents’ preferred conditions measured using a fully randomized conjoint experimental design when the participant responded to the survey between 01/11/2022 and 15/11/2022 2. Experiences of “COVID-19 arm” symptoms measured using a background characteristics survey when the participant responded to the survey between 01/11/2022 and 15/11/2022

—

Countries

Japan

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026