The point prevalence of TD as assessed by Abnormal Involuntary Movement Scale (AIMS) was determined for chronic wards with 361 schizophrenic patients(194 male, 167 female) (mean age 37.3 ± 10.4) at the time of the study. The results were as follows : 1) When T D was defined as those with a rating 3 or higher for any one or more than one of seven body items, the prevalence rate was 17.0% in 194male schizophrenics, 22.8% in female and mean 19.7%. 2) Among the risk factors, age was statistically significant relationship with the occurrence of TD and there was no significant relationship between the occurrence of TD and there was no significant relationship between the occurrence of TD and sex, the use of antiparkinsonian agent, history of electroconvulsive therapy and dosage of antipsychotics at the examination. 3) TD of the orofacial region was positively associated with age and history of ECT, while TD of non-orofacial (trunk and extremities) regions were not related. Our findings suggest that prevalence of TD in the schizophrenics was positively associated with age, and TD of the orofacial and non-orofacial regions may be distinct clinical syndromes, each having a different set of etiological determinants.
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