An autosomal study from 2011 (with nearly almost 1000 samples from all over the country, "whites", "pardos" and "blacks") has also concluded that European ancestry is the predominant ancestry in Brazil, accounting for nearly 70% of the ancestry of the population. "In all regions studied, the European ancestry was predominant, with proportions ranging from 60.6% in the Northeast to 77.7% in the South". The "pardos" included were found to be predominantly European in ancestry on average. The 2011 autosomal study samples came from blood donors (the lowest classes constitute the great majority of blood donors in Brazil), and also public health institutions personnel and health students.