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Twenty patients with the diagnosis hysterical personality disorder were compared with a matched control group pf patients with other personality and neurotic diagnoses. Subjects' moods were assessed with a visual analogue scale 4 times a day for 5 consecutive days. Patients with a primary discharge diagnosis of hysterical personality disorder showed greater variability of mood than controls. Since emotional lability is said to be a characteristic hysterical trait, the results are taken as empirical support for the validity of one of the clinical judgements inherent in the diagnostic process.
Slavney et al. (Tue,) studied this question.