2020 nhis
2020 NHIS
The COVID-19 pandemic created challenges conducting in-person interviews for the 2020 NHIS, requiring changes to field procedures. These changes resulted in three analytic data files for sample adults.
- Sample Adult Interview for single-year 2020 estimates and trend analyses
- Sample Adult Longitudinal for analyses of data from 2019 and 2020 for the same individuals
- Sample Adult Partial for combining data from multiple years that include 2019 and 2020
Using the NHIS
- Survey Description Document [2.7 MB]
- Weighting Procedures and Nonresponse Bias Evaluation [562 KB]
- Weighting and Analysis Reference Table [92 KB]
- Imputed Income Technical Document [422 KB]
- Paradata Survey Description Document [414 KB]
- Restricted-use Variable Access
- Industry and Occupation Appendix [62 KB]
- File Record Length and Size Summary [92 KB]
- Checksum [94 KB]
Survey Implementation Materials
- Survey Questionnaire – English [PDF – 4.3 MB]
- Survey Questionnaire – Spanish [PDF – 4.4 MB]
- NHIS Sponsored Content [290 KB]
- Field Representative Manual [PDF – 4.3 MB]
- NHIS Instrument Flowchart, Q1-Q2 [PDF – 102 KB]
- NHIS Instrument Flowchart, Q3-Q4 [180 KB]
- Survey Brochure [343 KB]
- Advance Letter [350 KB]
- Advance Letter for Reinterview [406 KB]
Page last reviewed: September 2, 2022
Content source: National Center for Health Statistics