An epidemiologic survey of rollerskating injuries in Metrovi

An epidemiologic survey of roller-skating injuries in Metroville, a city with a population of 100,000 (during the midpoint of the year), produced the following data for a particular year:

Number of skaters in Metroville during any given month 12,000
Roller-skating injuries in Metroville 600
Total number of residents injured from roller-skating 1,800
Total number of deaths from roller-skating 90
Total number of deaths from all causes 900

The proportional mortality ratio (%) due to roller-skating was:

90/600 × 100

90/100,000 × 100

90/1,800 × 100

90/900 × 100

Solution

How is defined, the proportional mortality rate:

Statistical method of relating the number of deaths from a particular condition to all deaths within the same populationgroup for the same period.a statistical method of relating the number of deaths from a particular condition to all deaths within the same populationgroup for the same period.

The proportional mortality ratio due to roller -skating was:

= Number of deaths from roller skating / total number of deatha due to any casuses in Mertroville

= 90/900 *100 = 10%

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