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The aim of this study was: a) to validate the questionnaire that measures FA by means of confirmatory analysis; b) to analyze reliability by means of stability measures; and c) develop percentiles by age and sex range. Material and methods: A cross-sectional descriptive study was carried out in 1,937 in university students (1,064 men and 873 women) from the city of Puno, Peru. The weight and height were measured and the Body Mass Index (BMI) was calculated by sex . An 11-question questionnaire was used that measures Physical Activity. It was validated by Factorial Confirmatory Analysis (AFC) and reliability was verified by test re-test. Percentiles were generated by age and sex range for AF patterns by the LMS method. Results: For the AFC, saturations were observed between 0.41 and 0.96, Eigen values greater than 1.0, and the variance explanation was 63.9% (Varimax and Kaiser-Meier-Olkin, KMO = 0.872 Sphericity of X2 = 4999.5, p <0.0000). Reliability by re-test showed a Technical Measurement Error (TEM) of 2.48 to 3.68% and an intra-class correlation coefficient (ICC) between 0.65 for men and 0.654 for women and for both sexes CCI = 0.92. Conclusion: The questionnaire of 11 questions that measures FA is valid and reliable for university students in a high altitude region of Peru. In addition, the proposed percentiles serve to identify and classify AF levels according to age and sex range.

Validación de un instrumento de medición de actividad física y propuesta de percentiles para su valoración en jóvenes universitarios