Published Date: December 09, 2021

Summary: As a large, well-established population survey, the California Health Interview Survey (CHIS) was well-poised to adapt to the changing conditions and challenges presented by the COVID-19 pandemic. The authors’ goal was to continue to provide equity-focused data products relevant to public health, but with a more rapid data processing timeframe to meet the immediate insights needed during the pandemic. This study uses data from the 2020 CHIS.

The CHIS sample design is intended to support annual estimates for California and many individual counties by aggregating all interviews conducted across all weekly sample waves. The need for timely data during the pandemic and the strong response observed during this time warranted examining the feasibility of producing more timely subannual estimates. CHIS employed a strategy that pooled all interviews conducted across sample waves within a given calendar month. Due to the pandemic and public health concerns, CHIS resolved to add COVID-19-related questions with the planning for a COVID-19 module beginning in mid-March 2020.

Findings: The 2020 CHIS demonstrated for the first time the viability of pooling completed surveys conducted across sample waves with a calendar month to produce monthly statewide estimates. The scientific value is largely to inform other surveys that reporting preliminary monthly estimates form an annual population-based survey is possible, albeit limited to a subset of indicators. COVID-19 exposed longstanding inequities shaped by socioeconomic conditions and opportunities.

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