Of all the ethnic groups that have been surveyed, Mestizos are notably absent, which is likely due to the label's fluid and subjective definition, which complicates its precise quantification. However it can be safely assumed that Mestizos make up at least the remaining 30% unassessed percentage of Mexico's population with possibilities of increasing if the methodologies of the extant surveys are considered. As example the 2015 intercensal survey considered as Indigenous Mexicans and Afro-Mexicans altogether individuals who self-identified as "part Indigenous" or "part African" thus, said people technically would be Mestizos. Similarly, White Mexicans were quantified based on physical traits and appearance, thus technically a Mestizo with a percentage of Indigenous ancestry that was low enough to not affect his or her primarily European phenotype was considered to be white. Finally the remaining ethnicities, for being of a rather low number or being faiths have more permissive classification criteria, therefore a Mestizo could claim to belong to one of them by practicing the faith, or by having an ancestor who belonged to said ethnicities.