The mortality rate can also be calculated using a similar formula to the incidence of COVID-19. The mortality rate is “a frequency of occurrence of death in a defined population during a specified interval” \citep{U.S.DepartmentofHealthandHumanServices2011}. Since the study focuses on a single cause, which is COVID-19, the measure for mortality will be a cause-specific death rate. The formula for the cause-specific death rate is the following:
\[\text{cause-specific mortality rate}=\frac{\text{deaths occurring during a given time period}}{\text{size of the population anong which the deaths occurred}}\cdot100000\]