Which statement best describes the difference between a proportionate mortality rate and a crude mortality rate?

• A. PMR is calculated with a denominator of total population; mortality rate uses total deaths.
• B. PMR measures the rate of new cases; mortality rate measures deaths per population.
• C. PMR is unaffected by age; mortality rate is age-adjusted.
• D. PMR measures the share of deaths due to a specific cause among total deaths; mortality rate measures deaths per population.

Answer: (D)

The concept being tested is that a proportionate mortality rate describes the share of deaths from a specific cause within all deaths, while a crude mortality rate is the actual number of deaths per population. PMR uses the count of deaths from a cause divided by total deaths in the group, giving a proportion rather than a true rate per people. It doesn’t involve the size of the population as a denominator, and it doesn’t measure the risk of dying from that cause in the population. In contrast, a crude mortality rate calculates deaths per population (often per 100,000 people), reflecting the overall risk of death in that population. So PMR tells you how deaths are distributed among causes, whereas crude mortality rate tells you how many people die overall in a given population.