Question

Asked May 27, 2019

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- An investigator wants to assess whether the use of a specific medication given to infants born prematurely is associated with developmental delay. Infants who were born prematurely are recruited and followed for 2-years. Some of the infants were given the medication at birth and others were not. All infants will undergo extensive testing at age 2 to assess various aspects of development.

What type of study design: The Case Report/Case Series, The Cross-Sectional Survey, The Cohort Study, The Case Control Study, The Nested Case-Control Study, The Randomized Controlled Trial or The Crossover Trial?

- Type of study:

- Is bias or cofounding a problem in this study? Give an example of a factor that may contribute to this problem.

Step 1

The cohort study generally involves a group of individuals that meet a set of criteria at the study start, who are disease free. The cohort is followed for few years and the associations are estimated between risk factor and the outcomes.

In the above study, the cohort is ‘the infants born prematurely’, who are followed for 2-years. They are divided into two groups to study that the specific medica...

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