Ego development and moral development in relation to age and grade level during adolescence.

The relation between Loevinger's measure of ego development and moral development as indexed by Rest's Defining Issues Test was examined in a sample of 517 adolescents between 12 and 21 years of age. Major increases in moral capacity were found at the Conformist and Conscientious levels of ego development. Low positive correlations between ego level and moral capacity were reported for young adolescents but not for older ones. The development indices of age and grade were compared. Both ego and moral development seemed more closely related to grade level than to age. Socioeconomic status predicted acceleration in ego development at the rate of one half an ego level over middle to late adolescence. This effect persisted at university. Students of higher socioeconomic background attained developmental levels one to two years before their contemporaries of low socioeconomic status. Sex differences in ego development were in favor of females.