• Lazare et al have demonstrated a factor structure similar to the oral, obsessive, and hysterical personality syndromes in a female patient population. The factor structure has been replicated in a sample of 99 predominantly "normal" female and male twin pairs. Furthermore, it was found that hysterical traits in female subjects and oral traits in male subjects seemed to have a genetic component. The study also indicated that environmental factors from an early age influence the development of the personality structure.
Cand Psychol ST. The Oral, Obsessive, and Hysterical Personality Syndromes: A Study of Hereditary and Environmental Factors by Means of the Twin Method. Arch Gen Psychiatry. 1980;37(11):1272–1277. doi:https://doi.org/10.1001/archpsyc.1980.01780240070008
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