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VOLUME 54 | NUMBER 4 | AUGUST 2019


Survey mode effects and insurance coverage estimates in the redesigned Gallup wellbeing index

Objective: To test whether a change from a telephone to mail and Internet survey in January 2018 affected the sample composition and uninsured estimates in the GallupSharecare WellBeing Index.

Data Sources: GallupSharecare WellBeing Index (20132018).

Study Design: Regression discontinuity analysis identified changes after the survey redesign in the estimated U.S. uninsured rate (adults 1864) and in the sample's demographic composition.

Principal Findings: After the survey redesign, the estimated uninsured rate fell 5.3 percentage points (<0.001), respondents were older and disproportionately white, more likely to have a college degree, and had higher average incomes. These changes were modestly reduced by survey weights.

Conclusions: The shift to a mail survey (with a web option) led to an older, more educated sample with fewer minorities, and a significant break in trend in the estimated uninsured rate.

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