Birth-order position was studied among 828 academically talented students from a national sample collected by the Institute for the Academic Advancement of Youth of Johns Hopkins University. When compared to 1990 U.S. Census Bureau data, this sample was disproportionately composed of first-born students. However, much of this birth order effect can be explained by the covariate of family size, with small families overrepresented among the gifted. First-born students tended to get higher verbal scores on the Secondary School Admissions Test while youngestborn tended to do better in math. Students were administered the Rotter Internal-External Locus of Control Scale, the Rosenberg Self-Esteem Scale, the Multidimensional Perfectionism Scale, the Adjective Cheek List, the NEO Five Factor Inventory, the Myers-Briggs Type Indicator, and the Brief Symptom Inventory. Except for a mild relationship between birth order and perfectionistic type, there was no relationship found betweenbirth-order position and personality and adjustment. It is believed that often reported birth-order position effects are strongly related to the covariance of family size.Of the major personality theorists, ~Bdler (1963) deals most directly with the issue of birth order. Adler believed that the demands ot each birth-order position typically, but not inevitably, structure the way the parents treat the child and help define the child's resulting personality. According to Adler, first-horns are sensitized to issues of authority and power, which they attempt to gamin through high levels of achievement. During periods of stress they would be more dependent, resulting in greater conformity to the expectations of others. IIe expected these children to feel hostile, pessimistic, insecure, and more likely to be maladjusted as an adult than later-born children. When the first-born is also an only-horn, Adier expected a preoccupation with being the center of attention that persists into adulthood, producing interpersonal difficulty when this need is unmet. Adler expected middleborn children to be the most ambitious and competitive. They tend toward rebelliousness, have difficulty accepting the role of follower, and are likely to be better adjusted than either first-born or last-born children. Adler expected last-born children to be most likely to experience feelings of inferiority and to be predisposed to alcoholism.
Studies in the General PopulationForer (1977) has described the following personality traits as being characteristic of first-borns: 1) high need for achievement, 2) high responsibility scores, 3) low test anxiety, 4) strong self-discipline, 5) need for approval by others, 6) susceptibility to social pressure, 7) conformitv to authority and regulation, and 8) task orientation. Later-borns are more oriented toward social relationships than to fulfilling task demands. In a study of predisposition to Type A behavior pattern among college students, Strube and Ota (1982) discovered that early-born (particularly first-born) students were most like...