Objective:

To carry out a reliability and construct analysis of the FANTASTIC MEX-A instrument through Cronbach's alpha (α) and exploratory factor analysis (EFA) in two Mexican institutions located in the state of Guerrero: a general headquarters and a private university, such as a pilot study to determine the feasibility of performing it on a large scale in Mexican adults.

Design:

Quantitative, cross-sectional, non-experimental, descriptive. Simple random sampling. Data collection from February 2021 to November 2022. Variables: Lifestyle level (dependent); occupation, gender, education, marital status, type of family, age and body mass index (attributive).

Results:

N=493, n=242, 49% participation (NC=95%, CI=4.5%), the sample consisted of 204 military personnel and 38 university teachers/administrators. Cronbach's alpha=0.869 (good), using the two-half method, α=0.76 was obtained for odd items and α=0.762 for even items, rho correlation between halves of 0.903 (strong correlation). Mean score obtained of 134.8 ± 17.7 points, equivalent to 72.5%. Nine factors with theoretical association were found, that explain 42.64% of the accumulated variance in the Exploratory Factor Analysis (EFA), 1: The protection of mental health and physical integrity, 2: Distress, 3: Affective interpersonal relationships, 4: The consumption of alcohol and substances of abuse, 5: Physical activity and associativity, 6: Tobacco consumption, 7: Sleep and diet, 8: Health control and 9: Physical appearance.

Conclusions:

Through the Cronbach's Alpha statistic by the two-half method, it was concluded that the FANTASTIC MEX-A instrument is consistent for the sample studied. The AFE determined construct validity for nine factors with theoretical association.

Limitations:

The study was conducted in the state of Guerrero, México, the validation of the instrument in Mexican adults requires a representative sample that considers subjects from various regions of the country.

Originality:

There are no publications that standardize the available versions of the instrument in Spanish. A unique version is provided that involved the revision and reconstruction of each item with supporting illustrations.

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