The mortality rate or death rate was a statistical measurement of the rate of deaths in a population.

The mortality rate of the Cerebus II rejuvenation process was high. (TNG: "Too Short a Season")

The cardiac replacement procedure known as Van Doren's technique had a mortality rate of 2.4%, which was considered low. (TNG: "Samaritan Snare")

By the end of the first month of Prefect Dukat's administration, the death rate in Bajoran labor camps was down by 20%. (DS9: "Waltz")

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