 The percentage of people with clinically diagnosed disease (symptoms prompting diagnostic testing) is 0.05–0.27% in various studies.However, population studies from parts of Europe, India, South America, Australasia and the USA (using serology and biopsy) indicate that the percentage of people with the disease may be between 0.33 and 1.06% in children (but 5.66% in one study of children of the predisposed Sahrawi people) and 0.18–1.2% in adults.Among those in primary care populations who report gastrointestinal symptoms, the rate of coeliac disease is about 3%.