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. 2022 Jan;31(1):269-280.
doi: 10.1007/s11136-021-02906-1. Epub 2021 Jun 18.

Psychometric properties of the PROMIS-57 questionnaire, Norwegian version

Stein Arne Rimehaug  1   2 , Aaron J Kaat  3 , Jan Egil Nordvik  4 , Mari Klokkerud  5 , Hilde Stendal Robinson  6
Affiliations

Psychometric properties of the PROMIS-57 questionnaire, Norwegian version

Stein Arne Rimehaug et al. Qual Life Res. 2022 Jan.

Abstract

Purpose: The aims of this cross-sectional study were to explore reliability and validity of the Norwegian version of the Patient-Reported Outcome Measurement System®-Profile 57 (PROMIS-57) questionnaire in a general population sample, n = 408, and to examine Item Response properties and factor structure.

Methods: Reliability measures were obtained from factor analysis and item response theory (IRT) methods. Correlations between PROMIS-57 and RAND-36-item health survey (RAND36) were examined for concurrent and discriminant validity. Factor structure and IRT assumptions were examined with factor analysis methods. IRT Item and model fit and graphic plots were inspected, and differential item functioning (DIF) for language, age, gender, and education level were examined.

Results: PROMIS-57 demonstrated excellent reliability and satisfactory concurrent and discriminant validity. Factor structure of seven domains was supported. IRT assumptions were met for unidimensionality, local independence, monotonicity, and invariance with no DIF of consequence for language or age groups. Estimated common variance (ECV) per domain and confirmatory factor analysis (CFA) model fit supported unidimensionality for all seven domains. The GRM IRT Model demonstrates acceptable model fit.

Conclusions: The psychometric properties and factor structure of Norwegian PROMIS-57 were satisfactory. Hence, the 57-item questionnaire along with PROMIS-29, and the corresponding 8 and 4 item short forms for physical function, anxiety, depression, fatigue, sleep disturbance, social participation ability and pain interference, are considered suitable for use in research and clinical care in Norwegian populations. Further studies on longitudinal reliability and sensitivity in patient populations and for Norwegian item calibration and/or reference scores are needed.

Keywords: Clinimetric; PROMIS; Patient-reported outcomes; Psychometric; Quality of life; Validity.

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Conflict of interest statement

Stein Arne Rimehaug serves as a national contact person for PROMIS in Norway, Aaron J Kaat and Stein Arne Rimehaug are both members of the 2020 and 2021 Scientific Advisory Committee for the PROMIS Health Organization International. J E Nordvik, M Klokkerud and H S Robinson have no conflicts of interest to disclose.

Figures

Fig. 1
Fig. 1
PROMIS-57 and 29 Standard error plots per domain, from Graded Response Model, reliability range. The horizontal axis represents the different ability/problem levels for each domain. θ = 0 representing the estimated mean from the IRT model, with a standard deviation of 1. The vertical axis represents the standard error (reliability), with reference reliabilities of .90 and .95. The lower the curve, the greater the reliability
Fig.2
Fig.2
PROMIS-57 vs PROMIS-29 comparison of IRT test information function (TIF) plots. The horizontal axis represents the different ability/problem levels for each domain, with θ = 0 representing the estimated mean from the IRT model, with a standard deviation of 1. The vertical axis represents the combined amount of IRT information from all items of that particular scale
Fig. 3
Fig. 3
Test characteristic curves (TCC) for Norway/USA language DIF in PROMIS Anxiety 8 Short Form. Left graph shows the TCC total consequence of DIF on the scoring of all 8 Norwegian (Norway) and United States (Wave1) PROMIS Anxiety items; the right graph shows the TCC for just EDANX05 with negligible DIF
See this image and copyright information in PMC

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