Abstract
To distinguish personality characteristics of only-born women, 25 only-born women were compared with 25 firstborn women with one younger brother and 25 firstborn women with one younger sister. The mean age was 22 yr. Gough's Adjective Check List, the Myers-Briggs Type Indicator, and the Parent Perception Index were used to measure self-image, sexual identity, preferences as to perception and judgment, and perceptions attributed to parents. A factor analysis resulted in 16 factors, which accounted for 80% of the variance of the data set. The 16 factors were used as variables in the discriminant analysis. The only-born women were confident, resourceful, and assertive. They were the most independent, the least anxious and conventional. The women with brothers were the most responsible. They were more dependent than the only women and also more interested in the opposite sex. The women with sisters were the most conventional and also the most dependent.
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