Construction and validation of the Pica and Rumination Questionnaire in Mexican adolescents and young adults.

Construction and validation of the Pica and Rumination Questionnaire in Mexican adolescents and young adults. Research on Pica and Rumination Disorders has focused on children, people with disabilities, and pregnant women. This has important implications because it is unknown whether these occur at other stages of development and in other populations. These conditions leads to important health problems and can even lead to death, so it is essential to have valid and reliable screening instruments. Therefore, the objective of this study was to develop an instrument to detect the symptoms and behaviors of Pica and Rumination disorders, as well as to determine their psychometric properties in Mexican adolescents and young adults. The items were prepared from the review of the literature and were subsequently submitted for review by seven experts in the area, obtaining Aiken's V coefficients that indicate a high agreement between judges regarding the content of the instrument. Likewise, the reliability of the scale was verified from the calculation of the alpha and omega coefficients, where the following indices were obtained: 0.85 and 0.93. Subse-quently, an Exploratory and Confirmatory Factor Analysis was carried out, where a structure of four factors was achieved that explains 48.35% of the variance, in addition to the following indices that corroborate an adequate fit CMIN = 2.41, GFI = 0.92; AGFI = 0.89; CFI = 0.93; RMR =.063 and RMSEA = 0.064. Finally, the calibration of the reagents was carried out where it was observed that all discriminated adequately. In conclusion, the psychometric properties obtained in this study show that the Pica and Rumination Questionnaire is valid and reliable.