What question did this study set out to answer?

This study aims to assess the effectiveness and cost-effectiveness of reminder strategies for increasing survey response rates among older adults.

Impact of Reminder Strategies on Survey Response in Older Adults: A Randomized Trial in Japan

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Randomized trial evaluates reminder strategies improving survey response in older adults, suggesting optimal approaches for participation.

This study aims to assess the effectiveness and cost-effectiveness of reminder strategies for increasing survey response rates among older adults.
Conducted a three-arm randomized controlled trial with 1500 adults aged 48–88 from the Japan Multi-Institutional Collaborative Cohort Chiba cohort.
Participants were randomized to receive no reminder, a reminder postcard, or a re-sent questionnaire with prepaid envelope.
Logistic regression was used to estimate adjusted odds ratios (ORs) for response within 60 days.
Response rates were 0.8% for no reminder, 12.1% for postcards, and 35.5% for re-sent questionnaires (P < 0.001).
Both reminder strategies significantly increased responses, without evidence of effect modification by age, sex, or education.
Cost per response was ¥867 for postcards and ¥503 for re-sent questionnaires.

Terada et al. (2026) studied this question.

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Randomized trial evaluates reminder strategies improving survey response in older adults, suggesting optimal approaches for participation.