1. What measure of disease frequency is each of the following? a. The percentage
ID: 247318 • Letter: 1
Question
1. What measure of disease frequency is each of the following? a. The percentage of freshman girls who become pregnant over the course of their high school years. b. The percentage of senior boys who are fathers at the time of graduation. c. The number of live born babies who die of sudden infant death syndrome during the first year of life per 100,000 person-years of follow-up. d. The percentage of infants weighing less than 2500 grams at birth. 2. Consider a class with 100 enrolled students. None of the students were ill at the beginning of the school year. On September 30, 5 students reported having gastroenteritis. All continued to be ill on October 1, but all 5 recovered within 3 days. On October 14, 3 more (different) students developed gastroenteritis. All of these students continued to be ill on October 15, but all 3 recovered 3 days later. Assume a student can't get gastroenteritis more than once. a. Calculate the prevalence of gastroenteritis in the class on October 1. b. Calculate the cumulative incidence of gastroenteritis in the class during the month of October.Explanation / Answer
ANSWER A)
1. The percentage of freshman girls who became pregnant intheir high school years measures the incidence rate of the event among the high school girls.
The incidence rate measure the frequency of new cases of disease in the population. This measure the risk population during the study period.
2. The percentage of senior boys who are fathers at time of graduation shows the incidence risk of the event among senior boys .
The incidence risk measures the frequency of new cases or the proportion of the individuals in the population who where initiall free of disease but develops disease during the time interval. This measure is related to the population at risk at the beginning of the study.
3. The number of live born babies who die of sudden infant death syndrome during first years of life per 100000 persons-years of follow up measures the prevalence of infant mortality .
The prevalence measures the proportion of the inviduals in the defined population who have disease at a specific point of time.
4. The percentage of infant weighing less than 2500 grams at birth shows the prevalence of low birth weight infants among the total births during a time period in a specified population
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