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Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Differential item functioning of the patient-reported outcomes information system (PROMIS ® ) pain interference item bank by language (Spanish versus English).
Quality of Life Research 2017 June
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.
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.
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