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HPEX 358 - Introduction to Epidemiology Questions with Correct Answers
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HPEX 358 - Introduction to Epidemiology Questions with Correct Answers
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HPEX 358 - Introduction to Epidemiology Questionswith Correct Answers
A study was conducted to quantify the effect of repeat chlamydia
infections on the occurrence of pelvic inflammatory disease (PID).
Women who attended certain gynecologic offices were classified as
exposed or not exposed based on whether or not they had chlamydia
infections two or more times in the current year. These two groups of
women (exposed and non-exposed) were then followed for three years
and examined for PID. What type of study design was used? Correct
Answer-prospective cohort
Ecologic studies use the group rather than the individual as the unit of
analysis. Correct Answer-true
Participants are classified according to their exposure to a factor of
interest and then are observed over time to document the incidence of
disease in what type of study? Correct Answer-prospective cohort study
A cohort study examined the effect of repeat chlamydia infections on the
occurrence of pelvic inflammatory disease (PID). Among the 1,000
women with repeat chlamydia infections, 240 developed PID. Among
the 2,000 women with no repeat chlamydia infections, 160 developed
PID. Using the proper measure of association, the estimated risk of PID
for women with repeat chlamydia infections was: Correct Answer-3.00
times
A systematic error that results in an incorrect or invalid estimate of the
measure of association is called: Correct Answer-bias
, A bias that results from procedures used to select study subjects and
from factors that influence participation in the study is called: Correct
Answer-selection bias
The odds ratio is a direct measure of risk. Correct Answer-false
In the UK, a study examining the association between obesity and
premenstrual symptoms (PMS) followed 2,000 obese and 1,000 normal
weight women for one year. At the end of the study period, 200 obese
and 50 normal weight women developed PMS. The measure of
association between obesity and PMS was: Correct Answer-relative risk
2.00
Which of the following ways experimental study differs from
observational study? Correct Answer-Experimental study assigns
subjects randomly to study groups.
A case control study assessed the possible preventive effect of oral
contraceptive on a woman's risk of having osteoporosis (bone disease).
Among the women with osteoporosis, 484 were identified as user of oral
contraceptive and 347 as non-user of oral contraceptive. On the other
hand, among the women without osteoporosis, 620 were identified as
user of oral contraceptives and 380 as non-users. What is the estimated
measure of association between use of oral contraceptives and having
osteoporosis? Correct Answer-0.85
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