Tardive dyskinesia--prevalence and subtypes at Valkenberg Hospital, Cape Town.

A survey of 278 White long-term inpatients at Valkenberg Hospital, Cape Town, revealed a 17% incidence of tardive dyskinesia. The heterogeneity of this condition is discussed and the incidence of the various subtypes is given. The relationship between tardive dyskinesia and certain risk variables such as age, duration of hospitalization and concomitant administration of anticholinergics, while clinically suggestive, was found to be not statistically significant.