How common is it? Are there risk categories?

According to the latest available data, approximately 210 million men worldwide, equal to 6% of the population, have BPH. In particular, the disease affects mainly men over 70; for men between the ages of 46 and 76, the risk of developing the disorder is 45%. Incidence rates vary from 3 cases per 1000 years/man between the ages of 45 and 49 (i.e., monitoring 1000 men for one year, you would expect to observe three cases) to 38 cases per 1000 years/man between the ages of 75 and 79. Prevalence is around 24% at age 80.

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