Academic achievement of twins and their single-born peers. Part 1

Abstract

The academic achievement level in twins and singletons from 2 to 11 grades was compared according to a 5-point scale. The subjects were 4564 twins and 4065 singletons (collective study, Department of behavioral genetics, Faculty of Psychology, Lomonosov Moscow State University). The analysis shows that twins having been behind in studies in primary school, make up for singletons already in 5 grade and further are equally successful.