UMIN-CTR Clinical Trial
| Unique ID issued by UMIN | UMIN000057567 |
|---|---|
| Receipt number | R000065775 |
| Scientific Title | Randomized Comparative Trial of Reminder Methods in Questionnaire Surveys: Analysis of the Effects of Reminder Postcards and Questionnaire Redelivery |
| Date of disclosure of the study information | 2025/04/09 |
| Last modified on | 2025/10/09 16:01:46 |
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Basic information
Public title
Randomized Comparative Trial of Reminder Methods in Questionnaire Surveys: Analysis of the Effects of Reminder Postcards and Questionnaire Redelivery
Acronym
REMIND Trial
Scientific Title
Randomized Comparative Trial of Reminder Methods in Questionnaire Surveys: Analysis of the Effects of Reminder Postcards and Questionnaire Redelivery
Scientific Title:Acronym
REMIND Trial
Region
| Japan |
Condition
Condition
Non-respondents to questionnaire surveys (individuals who did not respond after initial survey distribution)
Classification by specialty
| Adult |
Classification by malignancy
Others
Genomic information
NO
Objectives
Narrative objectives1
In this study, we will evaluate the effectiveness of three reminder methods in improving response rates through a randomized controlled trial (RCT) in the Chiba area of the "Japan Multi-Institutional Collaborative Cohort Study" (J-MICC Study):
(1) No reminder sent (control group)
(2) Reminder postcard sent
(3) Questionnaire redelivery
The purpose of this study is to examine strategies for improving collection rates in mail surveys targeting elderly Japanese populations, with the aim of enhancing evidence-based health policies and contributing to the development of international epidemiological research and public health policies.
Basic objectives2
Efficacy
Basic objectives -Others
Trial characteristics_1
Confirmatory
Trial characteristics_2
Pragmatic
Developmental phase
Not applicable
Assessment
Primary outcomes
Response proportion: The response rate (number of submissions/number sent) will be calculated for each group.
Key secondary outcomes
Response acquisition cost: The average cost (including printing, postage, redelivery expenses, etc.) required to obtain one response will be calculated for each intervention method.
Response quality: The proportion of complete responses (percentage of responses with all items completed) will be compared.
Base
Study type
Interventional
Study design
Basic design
Parallel
Randomization
Randomized
Randomization unit
Individual
Blinding
Open -no one is blinded
Control
No treatment
Stratification
NO
Dynamic allocation
NO
Institution consideration
Institution is not considered as adjustment factor.
Blocking
YES
Concealment
Central registration
Intervention
No. of arms
3
Purpose of intervention
Educational,Counseling,Training
Type of intervention
| Other |
Interventions/Control_1
Control group (no notification group): No reminder sent.
Interventions/Control_2
Reminder postcard group: Reminder postcard sent.
Interventions/Control_3
Questionnaire redelivery group: Questionnaire redelivered.
Interventions/Control_4
Interventions/Control_5
Interventions/Control_6
Interventions/Control_7
Interventions/Control_8
Interventions/Control_9
Interventions/Control_10
Eligibility
Age-lower limit
| 47 | years-old | <= |
Age-upper limit
| 88 | years-old | >= |
Gender
Male and Female
Key inclusion criteria
In the Chiba area, the third health survey was conducted by mail on September 18, 2024. This study will target individuals who have not submitted the questionnaire as of the approval date of this study.
Key exclusion criteria
Subjects who did not provide consent after receiving study explanation following the intervention trial.
Target sample size
1500
Research contact person
Name of lead principal investigator
| 1st name | Nobuaki |
| Middle name | |
| Last name | Michihata |
Organization
Chiba Cancer Center Research Institute
Division name
Cancer Prevention Center
Zip code
260-8717
Address
666-2 Nitona-cho, Chuo-ku, Chiba 260-8717, Japan
TEL
+81-43-264-5431
nmichihata@chiba-cc.jp
Public contact
Name of contact person
| 1st name | Nobuaki |
| Middle name | |
| Last name | Michihata |
Organization
Chiba Cancer Center Research Institute
Division name
Cancer Prevention Center
Zip code
260-8717
Address
666-2 Nitona-cho, Chuo-ku, Chiba 260-8717, Japan
TEL
+81-43-264-5431
Homepage URL
nmichihata@chiba-cc.jp
Sponsor or person
Institute
Chiba Cancer Center Research Institute
Institute
Department
Personal name
Funding Source
Organization
Chiba Cancer Center Research Institute
Organization
Division
Category of Funding Organization
Local Government
Nationality of Funding Organization
Other related organizations
Co-sponsor
Name of secondary funder(s)
IRB Contact (For public release)
Organization
Chiba Cancer Center
Address
666-2 Nitona-cho, Chuo-ku, Chiba 260-8717, Japan
Tel
+81-43-264-5431
chiken@chiba-cc.jp
Secondary IDs
Secondary IDs
NO
Study ID_1
Org. issuing International ID_1
Study ID_2
Org. issuing International ID_2
IND to MHLW
Institutions
Institutions
Other administrative information
Date of disclosure of the study information
| 2025 | Year | 04 | Month | 09 | Day |
Related information
URL releasing protocol
Publication of results
Unpublished
Result
URL related to results and publications
Number of participants that the trial has enrolled
1468
Results
Response rates were 0.8% in the control group, 12% in the postcard group, and 36% in the re-sent group (p < 0.001 for all comparisons). Logistic regression confirmed both interventions significantly increased responses compared with no reminder, independent of participant characteristics. Cost per response was 872yen for postcards and 505yen for re-sent questionnaires, making the latter more cost-effective despite higher total cost.
Results date posted
| 2025 | Year | 10 | Month | 09 | Day |
Results Delayed
Results Delay Reason
Date of the first journal publication of results
| 2025 | Year | 10 | Month | 09 | Day |
Baseline Characteristics
Participant flow
Adverse events
Outcome measures
Plan to share IPD
IPD sharing Plan description
Progress
Recruitment status
Completed
Date of protocol fixation
| 2025 | Year | 04 | Month | 09 | Day |
Date of IRB
| 2025 | Year | 04 | Month | 18 | Day |
Anticipated trial start date
| 2025 | Year | 05 | Month | 12 | Day |
Last follow-up date
| 2025 | Year | 07 | Month | 12 | Day |
Date of closure to data entry
Date trial data considered complete
Date analysis concluded
Other
Other related information
Management information
Registered date
| 2025 | Year | 04 | Month | 09 | Day |
Last modified on
| 2025 | Year | 10 | Month | 09 | Day |
Link to view the page
Value
https://center6.umin.ac.jp/cgi-open-bin/ctr_e/ctr_view.cgi?recptno=R000065775
| Research Plan | |
|---|---|
| Registered date | File name |
| 2025/10/09 | 研究計画書20250403.docx |
| Research case data specifications | |
|---|---|
| Registered date | File name |
| 2025/10/09 | 該当しない.docx |
| Research case data | |
|---|---|
| Registered date | File name |
| 2025/10/09 | 該当しない.docx |
Single case data URL
Value
https://center6.umin.ac.jp/ice/65775
