When you want to make a specific study of a population that presents an epidemic, you evaluate the probability of contracting the epidemic, who are more predisposed to acquire it (children, adults, elderly people). In the centers of attention a systematized control is carried out that allows to know how many people enter the asitencial center. Statistically speaking, it allows accounting for the most common diseases that the population has. Through statistic, you can find out how many people died each year, due to the disease they died and the symptoms they presented. Through the statistics in the medical care career you can count the amount of medical staff that the health center has, its different specialties and the number of patients attended, either by day, month or year