Which of the following is a prospective cohort study?
a. All of the children in Toledo, Ohio, are weighed and measured to obtain an accurate statistic for malnutrition occurrence.
b. A physician's records are analyzed to identify how many of his patients have remained in his care for more than 20 years.
c. The citizens of a city experiencing a nuclear accident are tracked for cancer occurrence.
d. A database is accessed to identify mortality rate in patients with sepsis.
ANS: C
A prospective study is an epidemiological study in which the researcher identifies a group of people who are at risk for experiencing a particular event. Sample sizes for these studies often must be very large, particularly if only a small portion of the at-risk group will experience the event. The entire group is followed over time to determine the point at which the event occurs, variables associated with the event, and outcomes for those who experienced the event compared with those who did not.
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