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For a chronic disease of low incidence and long duration, prevalence of the disease increases relative to incidence.

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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: 1800 Total number of deaths from roller-skating: 90 Total number of deaths from all causes: 900 The cause-specific mortality rate from roller-skating was:


A) 90/600 × 100,000.
B) 90/100,000 × 100,000.
C) 90/1800 × 100,000.
D) 90/900 × 100,000.

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Blood pressure measurements on adult males 30-39 years of age were obtained in a survey of a representative sample of Twin Cities households. To compare the frequency of hypertension in the white and nonwhite populations surveyed, the most appropriate measure is the:


A) incidence rate.
B) prevalence.
C) race-specific incidence rate.
D) race-specific prevalence.
E) race-specific age-adjusted prevalence.

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Calculation of the standardized mortality ratio is an example of the direct method of age adjustment.

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Which of the following terms is expressed as a proportion (as distinguished from a ratio) ?


A) Male Births / Female Births
B) Female Births / Male + Female Births
C) Female Births/ Male Births
D) Female Births / Male + Female Births and Male Births / Female Births

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A prerequisite for using the direct method of age adjustment is that the age-specific death rates in the study population must be stable.

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Expressing the burden or extent of some condition or attribute in a population:


A) uses primarily incidence data.
B) uses primarily prevalence data.
C) could use both incidence and prevalence data equally.
D) uses neither incidence data nor prevalence data.

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The risk of acquiring a given disease during a time period is best determined by:


A) the mortality rate from that disease in the 0-4 age group.
B) a spot map that records all cases of the disease in the past year.
C) the period prevalence for that disease during the past year.
D) the incidence rate (cumulative incidence) for that disease in a given period of time.

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Beach City has a rising population of 500,000 robust, fertile males and 450,000 robust, fertile females. If there were 4000 live births, 3 fetal deaths, and 40 maternal deaths, what is the crude birth rate?


A) 4000/500,000 × 1000
B) 4000/450,000 × 1000
C) 4000/950,000 × 1000
D) 4003/950,000 × 1000
E) 3997/950,000 × 1000

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