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Background: The only complete and validated tool for evaluating professional orchestra musicians is the English-language Musculoskeletal Pain Intensity and Interference Questionnaire for professional orchestra Musicians (MPIIQM) questionnaire, which, in recent years, has been translated, adapted, and validated in other languages. The aim of the study was to validate the online version of the Polish version of the Musculoskeletal Pain Intensity and Interference Questionnaire for Musicians (MPIIQM-P). Materials and Methods: The group included 182 professional musicians. The respondents were asked to complete the MPIIQM-P, BPI, and QuickDash questionnaires twice within an interval of 4 days. The questionnaires were created in the web form creator—Google Form. Results: The EFA analysis showed a two-factor structure of the questionnaire consisting of factor 1—pain intensity and factor 2—pain interference. The internal agreement of the factors identified in the EFA analysis was measured by the α Cronbach index reaching from 0.813 to 0.913. The intraclass correlation coefficient of both factors ranged from 0.276 to 0.583. The analysis of convergent and divergent validity between the subscales of the questionnaire value ranged from 0.414 to 0.925. Conclusions: The online version of the MPIIQM-P questionnaire is a valid and reliable tool for the assessment of musculoskeletal pain and interference. The online MPIIQM-P questionnaire maintains the psychometric properties previously defined for the paper version. [ABSTRACT FROM AUTHOR]

Low vision (LV) has a substantial impact on an individual's daily functionality and patient-reported outcome measures (PROMs) are increasingly incorporated into the evaluation of this problem. The objective of this study was to describe the design of the new "Life for Low Vision Questionnaire (LIFE4LVQ)", as a measure of daily functionality in LV and to explore its psychometric properties. A total of 294 participants completed the LIFE4LVQ and the data were subjected to Rasch analysis to determine the psychometric properties of the questionnaire, including response category ordering, item fit statistics, principal component analysis, precision, differential item functioning, and targeting. Test–retest reliability was evaluated with an interval of three weeks and intraclass correlation coefficients (ICC) were used. The correlation between the questionnaire score and Best Corrected Visual Acuity (BCVA) was examined using Spearman's correlation coefficient. Rasch analysis revealed that for most items the infit and outfit mean square fit values were close to 1, both for the whole scale and its subscales (ability and independence). The separation index for person measures was 5.18 with a reliability of 0.96, indicating good discriminant ability and adequate model fit. Five response categories were found for all items. The ICC was 0.96 (p < 0.001; 95% CI, 0.93–0.98), suggesting excellent repeatability of the measure. Poorer BCVA was significantly associated with worse scores (rho = 0.559, p < 0.001), indicating excellent convergent validity. The functional, 40-item LIFE4LVQ proved to be a reliable and valid tool that effectively measures the impact of LV on ability and independence. [ABSTRACT FROM AUTHOR]