Abstract

AGUIRRE, J F et al. Composition and factorial invariance of the Measurement of Intention to be Physically Active (MIFA) questionnaire among Mexican adolescents. CPD [online]. 2020, vol.20, n.2, pp.243-252.  Epub July 13, 2020. ISSN 1989-5879.

The aim of this research was to analyze the psychometric properties proposed by Moreno et al. (2007) for the Measurement of Intention to be Physically Active (MIFA) questionnaire. The total sample has been composed by 549 Mexican adolescents, 256 women and 293 mean, with ages from 11 to 16 years (M = 12.91, SD = 0.49). The factor structure of questionnaire has been analized through the confirmatory factor analysis. This analysis shows that a unifactorial structure is viable and adequate for the total sample (GFI = .999; RMSEA < .001; CFI = 1.000) and the populations of men (GFI = .991; RMSEA = .074; CFI = .995) and women (GFI = .995; RMSEA = .032; CFI = .999). The unifactorial structure, according to statistical and substantive criteria, has shown adequate indicators of reliability and validity adjustment. On the other hand, the factorial structure, the factorial loads and the intercepts are considered invariant according to gender; however, there are differences between men and women for the average intentionality of being physically active. In conclusion, the MIFA-M can be a useful tool to advance in the study of the factors that affect the practice of physical activity.

Keywords : Validity; Reliability; Psychometrics; Psychological assessment; Motivation.

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