Sylvia H Paz1, Karen L Spritzer2, Steven P Reise3, Ron D Hays2,4. 1. 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. 2. UCLA Division of General Internal Medicine and Health Services Research, Department of Medicine, 911 Broxton Avenue, Los Angeles, CA, 90095-1736, USA. 3. UCLA Department of Psychology, Franz Hall, 502 Portola Plaza, Los Angeles, CA, 90095, USA. 4. RAND, 1776 Main Street, Santa Monica, CA, 90407, USA.
Abstract
BACKGROUND: About 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. METHODS: A 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. RESULTS: One of the 41 items in the Spanish version of the PROMIS® PI item bank was identified as having significant uniform DIF. CONCLUSIONS: English- 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.
BACKGROUND: About 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. METHODS: A 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. RESULTS: One of the 41 items in the Spanish version of the PROMIS® PI item bank was identified as having significant uniform DIF. CONCLUSIONS: English- 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.
Entities:
Keywords:
Item response theory; Language DIF; PROMIS®; Patient-reported outcomes; Psychometrics
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