“…However, the validity of this color classification system is questionable for admixed populations because it is based on a subjective trait and apparently does not distinguish individuals by ancestral groups (Parra et al, 2003;Pimenta et al, 2006;Suarez-Kurtz et al, 2007;Santos et al, 2009;Lins et al, 2011;Pena et al, 2011;Leite et al, 2011). Moreover, self-identification has been shown to change over time (Hitlin et al, 2006;Santos et al, 2009), and even between sibling pairs, there was no satisfactory agreement between self-reported skin color groups or between self-reported skin color and melanin levels (Leite et al, 2011). According to Pena (2007), morphological traits are poor indicators of ancestral origin; therefore, this type of classification is merely social and may lead to misinterpretations in epidemiological studies.…”