- An epidemiologic survey of roller-skating accidents in Juneau, Alaska, a city
ID: 139698 • Letter: #
Question
- 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
- calculate crude death rate: ((# of deaths in a given year/ Reference population (during midpoint of the year))x 100,000)
- The cause-specific mortality rate from roller-skating: ((Mortality (or frequency of a given disease)/population size at midpoint of time period) x 100,000)
- The proportionate mortality (%) due to roller-skating was: ((mortality due to a specific cause during a time period/mortality due all causes during the same time period )x100)
- The case fatality rate of roller-skating accidents was: ((# of deaths due to disease/# of cases of disease) x100)
Explanation / Answer
Answer:
crude death rate: it is the number of deaths occurung among the population of a given geografical area during given year per 1000 mid year total population of the given geografical area during same year Multiplied by 100000.
- in given above question :
- crude death rate is 900.
*CAUSE SPECIFIC MORTALITY RATE :
Cause specific mortality rate is the number of deaths from specified cause per 100000 person - year at risk .
- the mortality rate from the specified cause for population .the numerator is the is the number of deaths attributed to specific cause during a specified time interval ,the denominator is the size of the population at the mid point of time interval.
- number of deaths from roller skating is 90,,.
- 90/10000 X 100000=90
- the cause specific death rate is 90.
*PROPORTIONATE MORTALITY RATE:
-it is a number of deths in a population due to specific disease or cause divided by the total number of deaths in the population during the time period such as year.
- total number of deaths in the year is 900.
- 90/900 x 100=10
- so ,the proportionate mortality rate is 10.
*CASE FATALITY RATE:
- it is the proportion dividing the number of deaths from a specified disease over a defined period of time by the numbercof dignosed with the disease during that time the resulting rtion is then multiplied by 100 to yield a percentage.
-
It is the proportionate deaths within the designed population of cases over the course of the disease dividing the number of death from a specified population.
- number of deaths due to skating is 90.
- total number of injured persons due to skating is 1800.
- 90/1800 x 100= 5.
So ,the case fatality rate is 5.
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