Continuity and Change in the 2025 NHIS Data

Collected annually since 1957, the National Health Interview Survey (NHIS) is the longest running nationally-representative health survey in the world. The NHIS questionnaire and data collection approaches have changed considerably over time, both to better capture emerging public health topics as well as to adapt the study design, questionnaire, and data collection operations to maintain a high-quality data product. The objective of this blog post is understanding the factors that contribute to year-to-year change in variables available from the NHIS with a particular focus on the 2025 NHIS data.

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