Health-Related Quality of Life in Adult Patients with Strabismus—Translation and Psychometric Testing of the Adult Strabismus Questionnaire (AS-20) into Finnish

Anna Mason (), Katja Joronen, Laura Lindberg, Anna-Maija Koivisto, Nina Fagerholm and Anja Rantanen
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Anna Mason: Faculty of Social Science, Health Sciences, Tampere University, 33014 Tampere, Finland
Katja Joronen: Department of Nursing Science, University of Turku, 20014 Turku, Finland
Laura Lindberg: Helsinki University Hospital, Helsinki University, 00290 Helsinki, Finland
Anna-Maija Koivisto: Faculty of Social Science, Health Sciences, Tampere University, 33014 Tampere, Finland
Nina Fagerholm: Helsinki University Hospital, Helsinki University, 00290 Helsinki, Finland
Anja Rantanen: Faculty of Social Science, Health Sciences, Tampere University, 33014 Tampere, Finland

IJERPH, 2023, vol. 20, issue 4, 1-13

Abstract: (1) Strabismus has an impact on individuals’ health-related quality of life. The impact should be assessed with valid patient-reported outcome measures such as the Adult Strabismus Questionnaire (AS-20). The AS-20 was further refined using a Rasch analysis for the American population. The aims of the study were to translate and culturally adapt the AS-20 into Finnish and to evaluate the psychometric properties of the Finnish AS-20. (2) The guidelines of the Professional Society for Health Economics and Outcomes Research steered the process and four items were added from the original data as Finnish additions. The construct and convergent validity and internal consistency were evaluated via psychometric testing for three potential Finnish AS-20 structures. The Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) checklist was applied. (3) The participants ( n = 137) reported that the translation was clear and understandable. All structures showed high reliability and internal consistency as measured using Cronbach alpha values. The convergent validity assessed using Spearman’s correlation coefficients between the structures and one item of Satisfaction with Life Scale indicated very low to moderate positive correlations. The construct validity evaluated using a confirmatory factor analysis revealed the refined AS-20 structure to be satisfactory. (4) The refined AS-20 can be used in clinical practice and research, but further validation is recommended.

Keywords: adult strabismus questionnaire AS-20; health-related quality of life; ophthalmic nursing; strabismus; instrument validation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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