3. In a study to determine the incidence of chronic disease, 150 people were exa

Question

3. In a study to determine the incidence of chronic disease, 150 people were examined at the end of the follow-up period. Twelves cases were found, giving a cumulative incidence rate of 8% (check if my calculation is correct). Fifty other members of the initial cohort could not be examined, 20 of them because they died. a. What source of bias should be of concern in this example (2 points) b. What will be the incidence rate if all people who were lost to be followed had the disease and what will be the incidence rate if all people who were lost to be followed did not have the disease. (Show your denominator and numerator in the calculation (4 points) c. Based on these calculations, do you think the 8% incidence rate is valid (i.e., accurate) Why yes or why not? (2 points) 3. In a study to determine the incidence of chronic disease, 150 people were examined at the end of the follow-up period. Twelves cases were found, giving a cumulative incidence rate of 8% (check if my calculation is correct). Fifty other members of the initial cohort could not be examined, 20 of them because they died. a. What source of bias should be of concern in this example (2 points) b. What will be the incidence rate if all people who were lost to be followed had the disease and what will be the incidence rate if all people who were lost to be followed did not have the disease. (Show your denominator and numerator in the calculation (4 points) c. Based on these calculations, do you think the 8% incidence rate is valid (i.e., accurate) Why yes or why not? (2 points) 3. In a study to determine the incidence of chronic disease, 150 people were examined at the end of the follow-up period. Twelves cases were found, giving a cumulative incidence rate of 8% (check if my calculation is correct). Fifty other members of the initial cohort could not be examined, 20 of them because they died. a. What source of bias should be of concern in this example (2 points) b. What will be the incidence rate if all people who were lost to be followed had the disease and what will be the incidence rate if all people who were lost to be followed did not have the disease. (Show your denominator and numerator in the calculation (4 points) c. Based on these calculations, do you think the 8% incidence rate is valid (i.e., accurate) Why yes or why not? (2 points)

Explanation / Answer

c)150 people were examined at the end of the follow-up period. Twelves cases were found, giving a cumulative incidence rate of 8%

i,e

8% of 150 is: (8/100)150=12

yes it is valid

b)Fifty other members of the initial cohort could not be examined, 20 of them because they died.

so total members are:150+50=200

in this 50 members 20 of them because they died.

so these 20 have chronic disease,

so totally:12+20=32 members have this chronic disease out of 200.

so 32 is how much % in 200 is

:16%

answer is:16%

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