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Reported flu shots when a shot meant getting paid

What happens to screening answers when one answer is the way in

Column chart: 52.2% reported a recent flu shot when it made no difference, and about 62% to 63% when it made them eligible for pay.
About one in ten more people said yes once yes meant getting paid Source: Fernandez Lynch et al., JAMA Network Open, 2019

Results from a randomised survey experiment with 2,275 respondents. When a recent flu shot had no bearing on eligibility, 52.2% reported one. When it made them eligible for a paid task, 63.1%, 62.8% and 62.1% reported one at 5, 10 and 20 dollars, and paying more did not increase lying. Use it as a reminder to write screening questions where the qualifying answer is not obvious, and to check answers against your own records where you can.

Where this appears

What's in this column chart

Reported a recent flu shot
Control group52.2%
$5 offered63.1%
$10 offered62.8%
$20 offered62.1%

Control: eligibility did not depend on a flu shot. 2,275 respondents in all.

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<p>Source: <a href="https://www.koji.so/visuals/paid-eligibility-reported-flu-shots-chart">Reported flu shots when a shot meant getting paid</a>, Koji</p>