Testosterone is the hormone responsible for masculine growth and development in male, when this hormone is not produced enough the condition is known as Male hypogonadism. This condition may is from the birth of an individual or it may occur in the middle due to injuries or infections.
This condition comes out with infertility, decrease in muscle mass and bone mass, etc during adulthood. In Hong Kong the mean age of the males was 56.22 +/- 8.82 years. The positive rates of LOH were 62.86% and 23.05% based on ADAM and AMS, respectively, and the incidence of erectile dysfunction (ED) was 68.83%.