Multiple Choice
A research team is interested in whether warfarin a medication to prevent clotting) reduces the risk of stroke. They ask warfarin's manufacturer for the number of annual warfarin prescriptions in the US from 1990-2000 and use data from death certificates to assess the numbers of deaths due to stroke in the US during the same time period. The resulting graph showed that the number of annual warfarin prescriptions increased in the US from 1990-2000 while stroke mortality in the US declined from 1990-2000. What type of study is this?
A) Ecological study
B) Cross-sectional study
C) Case-control study
D) Randomized trial
Correct Answer:
Verified
Correct Answer:
Verified
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