In 1984, a study called "Sociogenetic Reference Framework for Public Health Studies in Chile", from the Revista de Pediatría de Chile determined an ancestry of 67.9% European, and 32.1% Native American. In 1994, a biological study determined that the Chilean composition was 64% European and 35% Amerindian. The recent study in the Candela Project establishes that the genetic composition of Chile is 52% of European origin, with 44% of the genome coming from Native Americans (Amerindians), and 4% coming from Africa, making Chile a primarily mestizo country with traces of African descent present in half of the population. Another genetic study conducted by the University of Brasilia in several American countries shows a similar genetic composition for Chile, with a European contribution of 51.6%, an Amerindian contribution of 42.1%, and an African contribution of 6.3%. In 2015 another study established genetic composition in 57% European, 38% Native American, and 2.5% African.