Many population studies exist, with considerable variation in the estimated incidence and prevalence reported. However, one study investigating prevalence among women in long-term care institutions in various countries found similar prevalence rates, ranging from 43% to 65%, across 7 countries in Europe and the US.[2] Studies have found a lower prevalence in black (9% to 50%), Hispanic (10% to 42%), and Asian (13% to 52%) women compared with white (17% to 66%) women, depending on the definition used.[3][4][5] Prevalence tends to increase gradually during adult life (affects 10% of women aged 20 to 24 years), reaching a plateau between 50 and 70 years, and then steadily increasing again after 70 years of age.[6][7]

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