• Sylvia H Paz, Karen L Spritzer, Steven P Reise, and Ron D Hays.
• UCLA Division of General Internal Medicine and Health Services Research, Department of Medicine, 911 Broxton Avenue, Los Angeles, CA, 90095-1736, USA. shpaz@ucla.edu.
• Qual Life Res. 2017 Jun 1; 26 (6): 1451-1462.

BackgroundAbout 70% of Latinos, 5 years old or older, in the United States speak Spanish at home. Measurement equivalence of the PROMIS® pain interference (PI) item bank by language of administration (English versus Spanish) has not been evaluated.MethodsA sample of 527 adult Spanish-speaking Latinos completed the Spanish version of the 41-item PROMIS® pain interference item bank. We evaluate dimensionality, monotonicity and local independence of the Spanish-language items. Then we evaluate differential item functioning (DIF) using ordinal logistic regression with item response theory scores estimated from DIF-free "anchor" items.ResultsOne of the 41 items in the Spanish version of the PROMIS® PI item bank was identified as having significant uniform DIF.ConclusionsEnglish- and Spanish-speaking subjects with the same level of pain interference responded differently to 1 of the 41 items in the PROMIS® PI item bank. This item was not retained due to proprietary issues. The original English language item parameters can be used when estimating PROMIS® PI scores.

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