Factorial analysis of the Brazilian-Portuguese version of the Work Ability Index, reproducibility and validity of the single item and the short version for online application.

BACKGROUND: The Work Ability Index (WAI) assesses work demands, health status, and physical and mental resources. OBJECTIVES: To evaluate the measurement properties of the WAI, single-item work ability score (WAS), and short version for online applications. METHODS: One hundred three workers completed the 3 versions of the WAI and the Perceived Stress Scale (PSS-10) questionnaire. The reproducibility and construct validity of the 3 versions of the WAI and their concurrent validity with the PSS-10 were tested. Statistical tests were performed with IBM® SPSS 28.0. RESULTS: The test-retest reliability of the WAI, WAS, and WAI short version ranged from good to excellent. The WAI and WAI short version showed excellent internal consistency. The construct validity of the WAS was moderate and positive and it was excellent and positive for the WAI short version. Concurrent validity of the WAI, WAS, and WAI short version was moderate and negative, and item mental resources were strong and negative. Factor analysis reached an acceptable level for all indexes (≥ 0.90). The analysis with two factors reached an acceptable level for all indexes (≥ 0.90) and was the best model. CONCLUSION: The reliability and construct and concurrent validity of the various versions of the WAI were strong to excellent in online applications. Confirmatory factor analysis demonstrated a new grouping of items for the WAI Brazilian version. However, it is necessary to be careful in the choice due to the distribution model of items in health domains and aspects of work.

Factor structure and short version of the modified Fresno test to assess the use of the evidence-based practice in physiotherapists.

BACKGROUND: The Modified Fresno Test has been used to evaluate the use of the Evidence-Based Physiotherapy (EBP). So far, none of the versions of the Fresno Test were subjected to analysis of the factorial structure. The objective of the study was to describe the exploratory and confirmatory factor structure of the Modified Fresno Test adapted to the Portuguese-Brazilian and analyze the statistical feasibility for the elaboration of a short version. METHODS: The questionnaire was applied with a convenience sample of 57 physiotherapists, being 36 professionals (13 of these also professors) and 21 students from the last semester of the physiotherapy course. Exploratory Factor Analysis (EFA) was performed by the method of principal components. Confirmatory Factor Analysis (CFA) was performed by the method of maximum likelihood. The total score of the answers in the test and retest was evaluated, totalling 228 observations. Reliability was assessed by means of internal consistency, using Cronbach's alpha coefficient. RESULTS: Reliability was satisfactory (α 0.81) for all questions of the instrument. The coefficient α calculated for the corrected item-total showed values higher than 0.20 except for item 9. Preliminary tests for Exploratory Factor Analysis showed acceptable values with Kaiser-Meyer-Olkin (KMO = 0.80) and Bartlett's test of sphericity [chi-square (78) = 1149.615, p < 0.001], indicating that the correlations were sufficient for analysis. The analysis revealed the presence of 3 factors (eigenvalues> 1), which explains 60.9% of the instrument's total variance. In Confirmatory Factor Analysis, none of the indices came close to an acceptable level (≥ 0.90), however, the second model which tested a three-factor structure provided a better fit to the data. From the results of this study the Modified Fresno Test short version was drawn. CONCLUSION: The analysis showed good factor validity and adequate internal consistency for the use of the instrument consisting of 13 questions and 3 factors. This model proved to be better than the original model. The short version consisting of 9 questions may be an appropriate alternative for use in the population of interest.