To test the hypothesis that later-born individuals are more socially adept than firstborns, the Jourard and Lasakow (1958) Self-disclosure Questionnaire was administered to 30 male and 30 female high school students. The hypothesis that later-born individuals would score higher than firstborns since a high score indicates a breaking down of interpersonal barriers (Jourard, 1958) was confirmed. Results also indicated a high degree of similarity between the college sample used in the Jourard (1958) study and the present high school students. Not only did high school females disclose more about themselves than high school males, but they also disclosed more to their mothers and female friends.
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