Assessing measurement invariance of MSQOL-54 across Italian and English versions

Andrea Giordano, Silvia Testa, Marta Bassi, Sabina Cilia, Antonio Bertolotto, Maria Esmeralda Quartuccio, Erika Pietrolongo, Monica Falautano, Monica Grobberio, Claudia Niccolai, Beatrice Allegri, Rosa Gemma Viterbo, Paolo Confalonieri, Ambra Mara Giovannetti, Eleonora Cocco, Maria Grazia Grasso, Alessandra Lugaresi, Elisa Ferriani, Ugo Nocentini, Mauro ZaffaroniAlysha De Livera, George Jelinek, Alessandra Solari, Rosalba Rosato

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: The Multiple Sclerosis Quality of Life-54 (MSQOL-54) is a specific multiple sclerosis (MS) health-related quality of life inventory consisting of 52 items organized into 12 subscales plus two single items. No study was found in literature assessing its measurement invariance across language versions. We investigated whether MSQOL-54 items provide unbiased measurements of underlying constructs across Italian and English versions. Methods: Three constrained levels of measurement invariance were evaluated: configural invariance where equivalent numbers of factors/factor patterns were required; metric invariance where equivalent factor loadings were required; and scalar invariance where equivalent item intercepts between groups were required. Comparative fit index (CFI), root mean square error of approximation (RMSEA), and standardized root mean square residual (SRMR) fit indices and their changes between nested models were used to assess tenability of invariance constraints. Results: Overall, the dataset included 3669 MS patients: 1605 (44%) Italian, mean age 41 years, 62% women, 69% with mild level of disability; 2064 (56%) English-speaking (840 [41%] from North America, 797 [39%] from Australasia, 427 [20%] from UK and Ireland), mean age 46 years, 83% women, 54% with mild level of disability. The configural invariance model showed acceptable fit (RMSEA = 0.052, CFI = 0.904, SRMR = 0.046); imposing loadings and intercepts equality constraints produced negligible worsening of fit (ΔRMSEA < 0.001, ΔCFI = − 0.002, ΔSRMR = 0.002 for metric invariance; ΔRMSEA = 0.003, ΔCFI = − 0.013, ΔSRMR = 0.003 for scalar invariance). Conclusions: These findings support measurement invariance of the MSQOL-54 across the two language versions, suggesting that the questionnaire has the same meaning and the same measurement paramaters in the Italian and English versions.

Original languageEnglish
Pages (from-to)783-791
Number of pages9
JournalQuality of Life Research
Volume29
Issue number3
DOIs
Publication statusPublished - Mar 1 2020

Keywords

  • Health-related quality of life
  • Measurement invariance
  • MSQOL-54
  • Multi-group confirmatory factor analysis
  • Multiple sclerosis

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

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