Validity evidence based on the internal structure of the brazilian version of the ‘International Fitness Scale’ (IFIS)
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Abstract
Background: The assessment of physical fitness levels in adolescents serves as a predictor for chronic degenerative diseases in adulthood. Therefore, the measurement using a simple, cost-effective, easily applicable, and with good psychometric properties tool like the International Fitness Scale is of global public health interest. Purpose: Validate the construct and reliability of the Brazilian version of the 'International Fitness Scale' (IFIS-BRA) in adolescents. Methods: 319 adolescents (12 to 17 years old) of both sexes underwent the IFIS-BRA assessment twice between two weeks. Construct validity was verified through exploratory factor analysis and internal consistency analysis (Cronbach's Alpha, McDonald's Omega, Composite Reliability and Higher Lower Limit). To assess plausibility, Unidimensional Congruence (UNICO) and Mean of Item Residual Absolute Loadings (MIREAL) tools were used. The test-retest method was used to assess the reliability between the two responses, using quadratic weighted Kappa. Results: The mean age of the sample was 14.7 years, with a higher prevalence of females. Internal consistency was adequate, with values: Cronbach's Alpha of 0.79, McDonald's Omega of 0.80, Composite Reliability of 0.80 and Greatest Lower Bound of 0.81. The UNICO value was 0.98 and the MIREAL value was 0.25, indicating validity and unidimensionality of the construct. The overall Kappa mean was 0.76 (substantial), which ranged from 0.63 to 0.89, and was classified from 'substantial' to 'almost perfect'. Conclusion: The instrument can be considered unidimensional and reliable, as it has factor validity that represents well the participants' self-reported physical fitness and has a satisfactory response capacity between the two evaluated moments, which can be a gain for science.
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