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. 2013 Sep;22(7):1819-30.
doi: 10.1007/s11136-012-0292-6. Epub 2012 Nov 3.

Evaluation of the Patient-Reported Outcomes Information System (PROMIS(®)) Spanish-language physical functioning items

Sylvia H Paz  1 , Karen L Spritzer, Leo S Morales, Ron D Hays
Affiliations

Evaluation of the Patient-Reported Outcomes Information System (PROMIS(®)) Spanish-language physical functioning items

Sylvia H Paz et al. Qual Life Res. 2013 Sep.

Abstract

Purpose: To evaluate the equivalence of the PROMIS(®) physical functioning item bank by language of administration (English versus Spanish).

Methods: The PROMIS(®) wave 1 English-language physical functioning bank consists of 124 items, and 114 of these were translated into Spanish.

Analysis: Item frequencies, means and standard deviations, item-scale correlations, and internal consistency reliability were calculated. The IRT assumption of unidimensionality was evaluated by fitting a single-factor confirmatory factor analytic model. IRT threshold and discrimination parameters were estimated using Samejima's Graded Response Model. DIF by language of administration was evaluated.

Results: Item means ranged from 2.53 (SD = 1.36) to 4.62 (SD = 0.82). Coefficient alpha was 0.99, and item-rest correlations ranged from 0.41 to 0.89. A one-factor model fits the data well (CFI = 0.971, TLI = 0.970, and RMSEA = 0.052). The slope parameters ranged from 0.45 ("Are you able to run 10 miles?") to 4.50 ("Are you able to put on a shirt or blouse?"). The threshold parameters ranged from -1.92 ("How much do physical health problems now limit your usual physical activities (such as walking or climbing stairs)?") to 6.06 ("Are you able to run 10 miles?"). Fifty of the 114 items were flagged for DIF based on an R(2) of 0.02 or above criterion. The expected total score was higher for Spanish- than English-language respondents.

Conclusions: English- and Spanish-speaking subjects with the same level of underlying physical function responded differently to 50 of 114 items. This study has important implications in the study of physical functioning among diverse populations.

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Figures

Fig. 1
Fig. 1
Impact of DIF on test characteristic curves
Fig. 2
Fig. 2
DIF impact at individual level
Fig. 3
Fig. 3
CAT-based theta estimates using English (x-axis) and Spanish (y-axis) parameters for 114 items in Spanish sample (n = 640, ICC = 0.89)
Fig. 4
Fig. 4
CAT-based theta estimates using English (x-axis) and Spanish (y-axis) parameters for 64 non-DIF items in Spanish sample (n = 640, ICC = 0.96)
See this image and copyright information in PMC

References

    1. http://www.census.gov/prod/cen2010/briefs/c2010br-02.pdf

    1. Shorris E. Latinos: A biography of the people. New York: W.W Norton & Co; 1992.
    1. Morales L, Kington R, Valdez R, et al. Socioeconomic, cultural, and behavioral factors affecting hispanic health outcomes. Journal of Health Care Poor Underserved. 2002;13(4):477–503. - PMC - PubMed
    1. California State Department of Finance. Current population survey report: March 2001 data. Sacramento: 2002. Nov,
    1. Los Angeles County Department of Health Services. Data collection and analysis division. Los Angeles: Vital Statistics of Los Angeles County; 2000.

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