Specified in limitations lines 993-997. Important to say is that ~89% of Mexican population is Hispanic. Only 6.6% belong to indigenous population and 5.9% to Afro-Mexican ethnic groups.
There is no description of the race and ethnic composition of the sample. I am not well-versed in the ethnic composition of Mexico, however, would it be helpful to know the degree of representation of, for example, youth who are Black, of Indigenous ancestry, and of European ancestry? Or are there other ethnic or cultural groups that should be represented?