Bergjuden
In 1913 the anthropologist K.M. Kurdov carried out measurements of a large group of Tat population of Lahij village and revealed fundamental differences of their physical-anthropological type from the Mountain Jews. Measurements of Tats and Mountain Jews were also made by some other researchers. [[Cephalic index]] measurements have showed that while for Tats mesocephalia and dolichocephalia are typical, extreme brachycephalia is typical for Mountain Jews. [[Dermatoglyphics|Dermatoglyphic]] characteristics of the Tats and Mountain Jews also exclude ethnic similarity. In 2012 a uniparental [[genetic marker]]s comparison between Judeo-Tat dialect and Muslim-Tat dialect speakers in Dagestan found independent demographic histories.