Four Decades of Population Health Data:   Michael Davern, PhD Pamela Jo Johnson, MPH, PhD State Health Access Data Assista...
Outline <ul><li>Overview </li></ul><ul><li>Background to IHIS </li></ul><ul><li>IHIS Collaborators  </li></ul><ul><li>Key ...
Overview <ul><li>The Integrated Health Interview Series (IHIS) is a five-year NICHD-funded collaboration at University of ...
IHIS Inventory (unintegrated) <ul><li>Current emphasis is 1969 - 2005 </li></ul><ul><ul><li>Data files: ~400 </li></ul></u...
Integrating the NHIS <ul><li>IHIS builds on model of the Integrated Public Use Microdata Series (IPUMS) </li></ul><ul><ul>...
IHIS Components <ul><li>Harmonization </li></ul><ul><li>Documentation </li></ul><ul><li>Dissemination </li></ul><ul><ul><l...
Harmonization: Translation Table
Data Dissemination
Variable Availability
Variable Availability in IHIS
Variable Description & Comparability
Variable Codes and Frequencies
Variable Codes (Composite Coding)
Data Extract Preferences
Data Extract Variable Selection
Data Extract Summary
Download Data & Documentation
IHIS Data Releases <ul><li>First public data release:  November 2006 </li></ul><ul><li>Second public data release: TODAY! ...
Future IHIS Data Releases <ul><li>Additional IHIS data will be released to the public on a bi-annual basis </li></ul><ul><...
For Additional Information <ul><ul><li>http://www.ihis.us </li></ul></ul><ul><ul><li>[email_address] </li></ul></ul><ul><u...
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Four Decades of Population Health: The Integrated Health Interview Series

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Presentation by Michael Davern at the National Health Interview Survey's 50th Anniversary Commemorative Conference, June 25 2007.

Published in: Health & Medicine, Technology
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Four Decades of Population Health: The Integrated Health Interview Series

  1. 1. Four Decades of Population Health Data: Michael Davern, PhD Pamela Jo Johnson, MPH, PhD State Health Access Data Assistance Center School of Public Health University of Minnesota NHIS 50 th Anniversary Commemorative Conference Hyattsville MD June 25, 2007 The Integrated Health Interview Series (IHIS)
  2. 2. Outline <ul><li>Overview </li></ul><ul><li>Background to IHIS </li></ul><ul><li>IHIS Collaborators </li></ul><ul><li>Key components to integration project </li></ul><ul><ul><li>Harmonization </li></ul></ul><ul><ul><li>Documentation </li></ul></ul><ul><ul><li>Dissemination </li></ul></ul><ul><li>IHIS data releases </li></ul>
  3. 3. Overview <ul><li>The Integrated Health Interview Series (IHIS) is a five-year NICHD-funded collaboration at University of Minnesota (Lynn Blewett PI) </li></ul><ul><ul><li>It involves the School of Public Health, SHADAC, and the Minnesota Population Center </li></ul></ul><ul><ul><li>We also rely heavily on the outstanding NCHS Health Interview staff </li></ul></ul><ul><li>Our goal is to Harmonize, document, and disseminate publicly-available data from NHIS for the period from 1963 to the present </li></ul><ul><li>How hard is this to do? </li></ul>
  4. 4. IHIS Inventory (unintegrated) <ul><li>Current emphasis is 1969 - 2005 </li></ul><ul><ul><li>Data files: ~400 </li></ul></ul><ul><ul><ul><li>Range = 5 to 16 files per year </li></ul></ul></ul><ul><ul><ul><li>Levels: household, family, person, episodes </li></ul></ul></ul><ul><ul><li>Variables: ~60,000 </li></ul></ul><ul><ul><ul><li>~34,000 unique variable names </li></ul></ul></ul><ul><ul><li>Household records: ~1.5 million </li></ul></ul><ul><ul><li>Person records: ~4 million </li></ul></ul><ul><ul><li>Lines of data: ~ 20 million </li></ul></ul><ul><ul><li>Documentation pages: Too many to count… </li></ul></ul><ul><ul><ul><li>In 2000, for example, there are over 3,000 pages of documentation describing 2,451 unique variables </li></ul></ul></ul><ul><li>We hope to eventually include 1963 – 1968 </li></ul><ul><ul><li>Data are being prepared for potential release by NCHS staff </li></ul></ul>
  5. 5. Integrating the NHIS <ul><li>IHIS builds on model of the Integrated Public Use Microdata Series (IPUMS) </li></ul><ul><ul><li>see www.ipums.org </li></ul></ul><ul><li>IPUMS spurred new research using harmonized microdata of U.S. census from 1850-2000 </li></ul><ul><li>IHIS will enhance the value of NHIS data and promote new research as well </li></ul><ul><ul><li>Access to harmonized data and comprehensive documentation from entire period </li></ul></ul><ul><ul><li>Consistent comparisons across 40 years of dramatic change in public health </li></ul></ul>
  6. 6. IHIS Components <ul><li>Harmonization </li></ul><ul><li>Documentation </li></ul><ul><li>Dissemination </li></ul><ul><ul><li>http://www.ihis.us </li></ul></ul>
  7. 7. Harmonization: Translation Table
  8. 8. Data Dissemination
  9. 9. Variable Availability
  10. 10. Variable Availability in IHIS
  11. 11. Variable Description & Comparability
  12. 12. Variable Codes and Frequencies
  13. 13. Variable Codes (Composite Coding)
  14. 14. Data Extract Preferences
  15. 15. Data Extract Variable Selection
  16. 16. Data Extract Summary
  17. 17. Download Data & Documentation
  18. 18. IHIS Data Releases <ul><li>First public data release: November 2006 </li></ul><ul><li>Second public data release: TODAY! </li></ul><ul><ul><li>Coincides with 50 th Anniversary Celebration of NHIS </li></ul></ul><ul><li>IHIS includes over 800 integrated variables from: </li></ul><ul><ul><li>Household and Person files for 1969-2005 </li></ul></ul><ul><ul><li>Sample Adult/Sample Child files for 1997-2005 </li></ul></ul><ul><ul><li>Access to Care supplements 1993-1996 </li></ul></ul><ul><li>Linking keys are provided to each years microdata so analysts can add variables not already released through IHIS </li></ul>
  19. 19. Future IHIS Data Releases <ul><li>Additional IHIS data will be released to the public on a bi-annual basis </li></ul><ul><ul><li>Accommodate other units of analysis, such as conditions, doctor visits, hospital episodes </li></ul></ul><ul><ul><li>Incorporate harmonized variables from other NHIS data files </li></ul></ul><ul><ul><li>Include soon-to-be released data from newly created NHIS public-use files from 1963 – 1968 </li></ul></ul><ul><ul><li>On-line questionnaire text linked to the corresponding variable descriptions </li></ul></ul><ul><ul><li>Worked examples using IHIS data to study health and health care over time, particularly in light of survey design changes </li></ul></ul>
  20. 20. For Additional Information <ul><ul><li>http://www.ihis.us </li></ul></ul><ul><ul><li>[email_address] </li></ul></ul><ul><ul><li>http://www.shadac.umn.edu </li></ul></ul><ul><ul><li>http://www.pop.umn.edu </li></ul></ul>

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