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Methodology
How Did the Gallup-Sharecare Well-Being Index Work?
Methodology

How Did the Gallup-Sharecare Well-Being Index Work?

Learn about the 2018 updates to the Gallup-Sharecare Well-Being Index methodology.

What was the Gallup-Sharecare Well-Being Index?

In 2008, Gallup and Sharecare initiated a partnership, merging decades of clinical research, health leadership, and behavioral economics research to track and understand the key factors that drive well-being. The Gallup-Sharecare Well-Being Index provided an in-depth view of Americans' well-being and offered insights into their attitudes and behaviors at the national, state and community levels.

The Well-Being Index measured Americans' perceptions of their lives and their daily experiences through five interrelated elements that make up well-being: sense of purpose, social relationships, financial security, relationship to community, and physical health.

How were interviews conducted for the Gallup-Sharecare Well-Being Index?

Before January 2018, Gallup interviewed U.S. adults aged 18 and older living in all 50 states and the District of Columbia using a dual-frame design, which included both landline and cellphone numbers. Gallup sampled landline and cellphone numbers using random-digit-dial methods. Gallup purchased samples for this study from Survey Sampling International (SSI). Gallup chose landline respondents at random within each household based on which member had the most recent birthday. Each sample of national adults included a minimum quota of 70% cellphone respondents and 30% landline respondents, with additional minimum quotas by time zone within region. Gallup conducted interviews in Spanish for respondents who were primarily Spanish-speaking. View the updated methodology.

How many people were interviewed as part of the Gallup-Sharecare Well-Being Index?

Before 2018, Gallup interviewed approximately 3,500 U.S. adults aged 18 and older each week. More than 175,000 respondents were interviewed each year, and over 2.6 million interviews were conducted, beginning in 2008.

How often were Gallup-Sharecare Well-Being Index interviews conducted?

After it began in 2008, the Gallup-Sharecare Well-Being Index survey was conducted every day, excluding major holidays and other events, for 350 days per year.

Were Gallup-Sharecare Well-Being Index samples weighted?

Yes, Gallup weighted samples to correct for unequal selection probability, nonresponse, and double coverage of landline and cellphone users in the two sampling frames. Gallup also weighted its final samples to match the U.S. population according to gender, age, race, Hispanic ethnicity, education, region, population density, and phone status (cellphone only, landline only, both, and cellphone mostly). Demographic weighting targets for the U.S. and states were based on the most recent Current Population Survey figures for the aged 18 and older U.S. population, while weighting targets for metropolitan areas and congressional districts were based on Nielsen Claritas statistics. Phone status targets were based on the most recent National Health Interview Survey. Population density targets were based on the most recent U.S. Census. All reported margins of sampling error included computed design effects for weighting.


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