2021 NHAMCS Questionnaires, Datasets, and Documentation

Overview

Resources on this page provide information about the 2021 National Hospital Ambulatory Medical Care Survey (NHAMCS) data collection, its participants, and its protocols, as well as analytic notes and references. They will help you understand, analyze, and use the 2021 NHAMCS data.

Emergency departments

Public use file

• Technical documentation
• ReadMe file
• SAS files
  • SAS ReadMe file
• SPSS files
  • SPSS ReadMe file
• Stata files
  • Stata ReadMe file

Masked design variables

NHAMCS public use data files for 1992–2022 contain sample design variables in masked form. The 2000–2022 public use files included masked sample design when first released.

Beginning with the 2002 public use files, two new masked design variables were added to the file. These new masked design variables should be used with statistical software that assumes a single stage of sampling. Since 2003, NHAMCS has only included these two masked design variables for variance estimation. Data users who wish to combine years of data from 2003 and beyond with years prior to 2002 will need to create these two variables for each file prior to 2002.

Find instructions for creating these variables in Using Ultimate Cluster Models with NHAMCS Public Use Files.

Survey instruments

• Emergency department patient record questions (sample card)
• Hospital induction interview questions

Resources

• NHAMCS Questionnaires, Datasets, and Documentation
  • Includes 2022 resources
• 2020 NHAMCS Questionnaires, Datasets, and Documentation
• 2019 NHAMCS Questionnaires, Datasets, and Documentation
• 2018 NHAMCS Questionnaires, Datasets, and Documentation