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Capgras Syndrome: Possibly More Common Among the Maori of New Zealand

Objective: The report describes an apparently greater incidence of Capgras syndrome among the Maori population compared with the European population, in the most easterly catchment area served by Tauranga Hospital in New Zealand's Bay of Plenty. Method: Over the last year we have become aware of five cases of Capgras syndrome in our catchment area. This area (population nearly 21 000) consists of a rapidly expanding new suburb of the city of Tauranga and a rural area extending 55 km east of the city. These figures were compared with those of the westerly catchment area served by Tauranga Hospital, where the psychiatric team is not aware of any examples of Capgras syndrome among their population. The 1996 census figures were obtained in order to calculate a population ethnicity breakdown. Results: Five cases of Capgras syndrome were identified in the most easterly catchment area where 19% of the population identified as Maori, 75% as European and 6% as other or non-specified. All of the cases occurred in Maori patients. This compares with no identified cases of Capgras syndrome in the most westerly catchment area where 12% of the population identified as Maori, 87% as European and 1% as other or non-specified. Four out of five cases were female. Two cases had a history of cannabis use. Three cases had exhibited dangerous behaviour towards family members. Conclusions: There is an apparently greater incidence of Capgras syndrome among the New Zealand Maori population compared with the European population in the most easterly catchment area served by Tauranga Hospital. In our population Capgras syndrome is a common, not rare, feature of psychotic illness, and the cases support a previously reported association of this syndrome with dangerousness.