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What is IHIS?

April 26, 2017ihis

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What is IHIS?

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The Integrated Health Interview Series (IHIS) is a harmonized set of data and documentation based on material originally included in the public use files of the U.S. National Health Interview Survey (NHIS) and distributed for free over the internet. IHIS currently consists of over 1000 integrated variables selected from more than 2000 variables included in the core survey household and person files for 1969 forward, the sample adult/sample child files for 1997 forward, and the Access to Care supplements for 1993-96. IHIS variables are given consistent codes and have been thoroughly documented to facilitate cross-temporal comparisons. The “integration” process is described more fully here. IHIS is not a collection of compiled statistics; it is composed of microdata. Each record represents a person, with all characteristics of that person numerically coded. These person records are organized into households, making it possible to study the characteristics of people in the context of thei