First-contact incidence rate of schizophrenia on Barbados

Background The incidence rate for broad schizophrenia among second-generati on African-Caribbean people in the United Kingdom has been reported as high . Ethnicity. migration and psychosocial stressors have been suggested as ca usal factors. Aims To determine the incidence of schizophrenia for the whole population o f Barbados using an identical methodology to two previous studies in Trinid ad (Bhugra et al, 1996) and London (Bhugra et al, 1997). Method A 12-month study of all persons in the 18-54-year age group presenti ng with a psychosis for the first time was carried out on the population of Barbados. Information was collected using World Health Organization screen ing and measurement instruments. Results On an island of just over a quarter of a million, 40 out of the 53 patients th at met the inclusion criteria we re categorised as S+ (narrow) schizophrenia, giving an incidence rate of 2.8/10000 (95% CI1.97-3.7). The incidence rate for broad schizophrenia was calculated at 3.2/10000 (95% CI2 .3-4.1), which is significantly lower than the comparable rate for London's African - Caribbeans of 6.6/10000 (95% CI4.5-8.7). Conclusions The very high rate for broad schizophrenia among African Caribb ean people in the UK is probably due to environmental factors. Declaration of interest Support received from the Sainsbury Family Charitab le Trusts.