Description the methods to use to quantify the extent of a disease by defining prevalence (the prop ...

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Description the methods to use to quantify the extent of a disease by defining prevalence (the proportion of the population that have a risk factor under study) and incidence (the likelihood of developing a disease). Find an epidemiological study in Saudi Arabia, if possible, on the cumulative incidence of a disease by using a person-time study where the participants either develop a disease during the specified time period.  Discuss the participants at risk at the beginning of the study and the persons who developed the disease during the study and discuss the concept of the incidence rate of the disease under study.