An epidemiologic survey of roller-skating accidents in Juneau, Alaska, a city with a population of 100,000, produced the following: Number of skaters in Juneau during any given month: 12,000
Roller-skating accidents in Juneau: 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

Required:
Calculate:
a. Crude death rate.
b. The cause-specific mortality rate from roller-skating.
c. The proportionate mortality (%).
d. The case fatality rate of roller-skating accidents.

A. 900

B. 90

C. 10%

D. 15%

Explanation:

A. Calculation for Crude death rate.

Crude death rate =900/100,000 × 100,000

Crude death rate =900

Therefore the Crude death rate was 900

B. Calculation for The cause-specific mortality rate from roller-skating

Cause-specific mortality rate from roller-skating=90/100,000 × 100,000

Cause-specific mortality rate from roller-skating=90

Therefore the Cause-specific mortality rate from roller-skating was 90

C. Calculation for The proportionate mortality (%).

Proportionate mortality (%)=90/900 × 100

Proportionate mortality (%)=10%

Therefore The proportionate mortality (%) was 10%

D. Calculation for The case fatality rate of roller-skating accidents.

Case fatality rate of roller-skating accidents=90/600*100

Case fatality rate of roller-skating accidents=15%

Therefore the Case fatality rate of roller-skating accidents was 15%

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