A study was conducted among teenagers in the New York City area to assess the re
ID: 3209328 • Letter: A
Question
A study was conducted among teenagers in the New York City area to assess the relationship between alcohol abuse and major depression. 150 teenagers who were admitted to local hospitals with their first episode of major depression were identified and interviewed about their drinking habits during the two years preceding their diagnosis. The investigators then identified 300 other teenagers who were admitted to local hospitals for fractures or other musculoskeletal injuries; none of which had a diagnosis of depression. These teens were interviewed about their drinking habits during the past two years. Among the 150 teens with major depression, 80 reported that they had abused alcohol (defined as having at least 7 drinks a week). Among the other 300 teenagers, 100 reported that they abused alcohol.
1a) What kind of study design is this?
Cohort study
Case-control study
Ecologic study
Randomized clinical trial
None of the above
1b)What is the incidence (i.e. risk) of depression among teenage alcohol abusers?
18%
44%
53%
60%
Cannot be computed from the data given
1c) Based on the data presented which of the following statements is (are) correct?
The odds of alcohol abuse is 2.3 times the odds in those with major depression than in those without major depression
Alcohol abuse may be a risk factor for major depression among teenagers
Both a and b
None of the above
Explanation / Answer
1 s ans )Ecological Study - A study in which at least one variable, either an exposure or the outcome, is measured at the group (not individual) level.
1 bans) 150-80 / 300-100 = 70 / 200
1 c ans)
The odds of alcohol abuse is 2.3 times the odds in those with major depression than in those without major depression
Alcohol abuse may be a risk factor for major depression among teenagers
Both a and b is ans
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