Epidemiology
Patients with DISH are typically asymptomatic, which limits estimates of prevalence. Reported prevalence rates range from 2.9% to 32.5%. Based on observations in clinical practice, men are more frequently affected by DISH than women. Studies support this with data suggesting a male to female ratio ranging from 2:1 to 7:1, although the study sizes were small and confounding factor adjustment was not consistently conducted.[5][6][7][8] Prevalence and incidence increases with age, with men aged over 50 years being most commonly affected.[9] In one US study of people over 50 years old, the prevalence of DISH in men was 25% and in women was 15%. In those over 80 years old, it was 28% in men and 26% in women.[10] There is no proven geographical epidemiology.
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