Which formula represents the crude mortality rate per 1,000?

Which formula represents the crude mortality rate per 1,000?

• A. Crude mortality rate equals deaths ÷ population total × 1,000
• B. Crude mortality rate equals deaths ÷ population total
• C. Crude mortality rate equals deaths per 1,000 population
• D. Crude mortality rate equals population ÷ deaths × 1,000

Answer: (A)

Expressing how many people die in a population per a fixed number of people is done by dividing the number of deaths by the population size and then scaling to the chosen unit. For a rate per 1,000, you take the deaths in the period, divide by the population, and multiply by 1,000. This yields a number that can be compared across populations or time periods, since it accounts for how many people were at risk. So the correct approach is deaths ÷ population total × 1,000. Leaving out the multiplier would give a simple proportion rather than a rate per 1,000, and reversing the division (population ÷ deaths) would misrepresent the relationship entirely.

Expressing how many people die in a population per a fixed number of people is done by dividing the number of deaths by the population size and then scaling to the chosen unit. For a rate per 1,000, you take the deaths in the period, divide by the population, and multiply by 1,000. This yields a number that can be compared across populations or time periods, since it accounts for how many people were at risk.

So the correct approach is deaths ÷ population total × 1,000. Leaving out the multiplier would give a simple proportion rather than a rate per 1,000, and reversing the division (population ÷ deaths) would misrepresent the relationship entirely.