Posted: October 3rd, 2016

The proportion of residents in each village who were carriers was computed and compared. What is the proper classification for this study?

12. A major problem resulting from the lack of randomization in a cohort study is: [ONE POINT]
a. The possibility that a greater proportion of people in the study may have been exposed
b. The possibility that a smaller proportion of people in the study may have been exposed
c. The possibility that a factor that led to the exposure, rather than the exposure itself, might have caused the disease
d. That, without randomization, the study may take longer to carry out
e. Planned crossover is more likely
13. Which of the following is an approach to handling confounding? [ONE POINT]
a. Individual matching
b. Stratification
c. Group matching
d. Adjustment
e. All of the above
14. It has been suggested that physicians may examine women who use oral contraceptives more often or more thoroughly than women who do not. If so, and if an association is observed between phlebitis and oral contraceptive use, the association may be due to: [ONE POINT]

a. Selection bias
b. Interviewer bias
c. Nonresponse bias
d. Recall bias
e. Surveillance bias

15. Residents of three villages with three different types of water supply were asked to participate in a survey to identify cholera carriers. Because several cholera deaths had occurred recently, virtually everyone present at the time underwent examination. The proportion of residents in each village who were carriers was computed and compared. What is the proper classification for this study? [ONE POINT]

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