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The influence of obsessive‐compulsive neurosis patients’ premorbid personality on obsessive‐compulsive symptoms and efficacy of medication

We conducted a survey with the Lynfield obsessive‐compulsive symptom questionnaire (revised version) on 48 obsessive‐compulsive neurotic patients as the survey subjects. In the factor analysis five factors of obsessions, were identified: (i) the desire for perfection; (ii) compulsive checking; (iii) washing; (iv) feelings of uncleanliness; and (v) anthropophobia. High correlations were noted between these factors. We also investigated the premorbid personalities of obsessive‐compulsive neurotic patients with a multidimensional personality scale and obtained an extroversion dimension and neuroticism dimension. The influence of these premorbid personality dimensions on obsessive‐compulsive symptoms became clear; (i) neuroticism is related to the levels of obsession after onset, but not related to compulsive behaviors; and (ii) No differences in premorbid personality dimensions were noted between compulsive checking and compulsive washing behaviors. We also studied whether it was possible to predict the efficacy of pharmacotherapy upon obsessive‐compulsive symptoms. It was elucidated that the obsessions of those whose premorbid personalities are emotionally stable and extroversive are susceptible to antidepressants. Based on these results, we discussed the usefulness of premorbid personalities in predicting diversity of obsessive‐compulsive symptoms, as well as in prediction the efficacy of medication.