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Measurement Equivalence of the K6 Scale: The Effects of Race/Ethnicity and Language (Assessment)

Publication Topics

California Health Interview Survey; 2009 California Health Interview Survey (CHIS 2009); Hispanic/Latino; Racial and Ethnic Groups

Publication Type

CHIS Journal Article

Publication Date


Author 1

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This study examined the measurement equivalence of the K6 across diverse racial/ethnic and linguistic groups in the U.S. differential item functioning analyses using item response theory were conducted among 44,846 U.S. adults drawn from the California Health Interview Survey. Results show that four items ("nervous," "restless," "depressed," and "everything an effort") varied significantly across races/ethnicities and four items ("nervous," "hopeless," "restless," and "depressed") varied significantly across languages. In additional effect size analyses designed to separate effects of race/ethnicity from language, the structure of the White English group was substantially different from both the Hispanic/Latino English group and Hispanic/Latino Spanish group, whereas the Hispanic/Latino Spanish group was not different from the Hispanic/Latino English group.

The findings suggest that there was evident measurement nonequivalence in the K6 among racially/ethnically and linguistically diverse adults and that the observed nonequivalence in the K6 appears to be driven by language rather than race/ethnicity.


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Journal Article: Measurement Equivalence of the K6 Scale: The Effects of Race/Ethnicity and Language

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Press Release

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California Health Interview Survey (CHIS)

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Version: 2.0
Created at 10/12/2015 3:00 PM by i:0#.f|uclachissqlmembershipprovider|celeste
Last modified at 10/12/2015 3:02 PM by i:0#.f|uclachissqlmembershipprovider|celeste