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The regression line predicting a winning time

Data from cohort study can be evaluated and/or analyzed using incidence rate, relative risk and mortality rate. Mortality rate is regarded as a descriptive frequency measure while incidence rate and relative risk as measures of comparative effect [6]. Cohort study analysis used the ratio of the rate of disease in the exposed group compared with the rate in the unexposed group.

Incidence rate

In epidemiology, incidence simply means the occurrence of new cases of disease, for example, new cases of Ebola disease, Lassa fever, or injury in a population during a specified period. The incidenceof a particular disease measures how quickly or frequently the disease of interest is been developed by people. Unlike prevalence, incidence considers only new cases, and it has a unit. In order to measure the incidenceof a disease, a cohort study should be conducted. The study will include participants who are at risk of developing the disease of interest. Then they should be followed to determine those that truly developed the disease. Incidence rate is one of the approaches of measuring the frequency of disease in a population. Therefore, the incidence rate of a disease measures the frequency of the disease occurrence in a population over a specified period. Incidence rates are subject to change over time, from disease to health, therefore the period of the cohort need to be specified.