The purpose of this study was to measure the incidence of coeliac disease in different ethnic communities and investigate the hypothesis that the incidence is decreasing in most European countries and the role incomplete retrieval of data may play. In a retrospective study of histologically confirmed cases of coeliac disease between 1975 and 1989 in the City of Leicester, 106 patients with coeliac disease were identified. Of these 86 were European and 20 Asian. The overall incidence of coeliac disease in Europeans was 2.5/10(5)/year (95% CI 2-3.2), in Gujaratis 0.9/10(5)/year (95% CI 0.4-1.8), and in Punjabis 6.9 (95% CI 3.2-12.3). These differences were independent of religious belief. The relative risk to Punjabis compared with Europeans is 2.9 (95% CI 1.5-5.3; chi 2 = 12.5, p < 0.01) and to Gujaratis 8.1 (95% CI 3-22.4; chi 2 = 25; p < 0.001). Gujaratis were at 0.4 risk of Europeans (90% CI 0.2-0.8; chi 2 = 6.7; p < 0.01). The incidence in the urban populations of Leicester was 6/10(5)/year (95% CI 1.3-1.9) which was significantly lower than the 3.2/10(5)/year (95% CI 2.7-3.8; chi 2 = 5.6; p < 0.001) in surrounding rural areas. This study shows that the incidence of coeliac disease in Punjabis (Sikhs, Hindus and Muslims) is 8 times higher than in Gujaratis (Hindus and Muslims) and 4 times higher than in Europeans in Leicester.