Can a $5 gift card or $100 drawing get more people to answer health surveys?

NCT ID NCT07755748

Not yet recruiting Knowledge-focused Sponsor: University of California, San Francisco Source: ClinicalTrials.gov ↗

First seen Aug 10, 2026 · Last updated Aug 11, 2026 · Updated 1 time

Summary

This trial asks whether offering a small financial reward encourages more people to complete a follow-up telephone survey as part of a glaucoma screening program. About 2,000 participants will be randomly assigned to receive a $5 gift card, entry into a monthly $100 drawing, or no incentive. The goal is to see which approach, if any, improves survey completion rates among at-risk Californians.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: Financial incentives: a $5 gift card or entry into a monthly $100 drawing
What this could lead to: If offering a small gift card or lottery entry boosts survey participation, it could help health programs collect better follow-up data from at-risk groups.
What could go wrong: This trial only tests survey response rates, not eye health outcomes. The incentives may not meaningfully improve participation, and results may not apply beyond this specific glaucoma screening program.

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Conditions

The condition(s) this trial relates to.

glaucoma

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

SCREENING

Contacts and locations

Locations

Baywell Health

Oakland, California, 94607, United States
University of California, San Francisco

San Francisco, California, 94158, United States

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