1 Never use a microwave or conventional oven to pre-heat your flask. 2  If your flask has not been used for some time, rinse with warm water to remove any residual odours.  DO NOT overfill your flask. Leave sufficient space in the neck to fit the stopper.
Prevalence is a measure of disease that allows us to determine a person's likelihood of having a disease. Therefore, the number of prevalent cases is the total number of cases of disease existing in a population.
It is thus a proportion, rather than a rate, although you may sometimes see it called a rate.. Prevalence provides a good way to indicate the burden of disease in a population. It is influenced by the incidence and by the duration of the condition: under most circumstances, prevalence = incidence Ã disease duration. MORTALITY RATE. The number of deaths per thousand population per year: in effect, the incidence of death in a population. It can refer to all causes of death, or can be a cause-specific mortality rate.