A specific mortality rate is defined as which of the following?

• A. Deaths during a set period divided by mid-point population limited to a specific disease, population group or combination
• B. Deaths in a population divided by total population
• C. Deaths due to all causes
• D. Deaths per incident cases

Answer: (A)

Specific mortality rate captures the risk of dying within a defined subgroup or for a specific cause over a set time. It is calculated by taking the number of deaths during that period attributed to the chosen cause (or limited to the chosen group) and dividing it by the mid-point population of that subgroup. Using the mid-point population helps minimize bias from population changes during the interval, giving a stable rate that reflects risk in the specified group rather than in the whole population. This distinguishes it from a crude mortality rate, which uses all deaths divided by the total population; from simply listing deaths without forming a rate; and from case fatality rate, which relates deaths to incident disease cases rather than to the population at risk.