A study was conducted between annual sales of asthma drug and death due to asthma. This is an example of? (AIIMS Nov 09)
- In Ecological or correlational studies the basic unit of the study is the entire population, hence the question mentions about the country on whom the results of the study will be applicable and not every individual of that country.
- All the other option in the question individual members of the population into account while drawing conclusions about the cause effect relation ship.
- These studies are suitable only for initial search of hypothesis.
- The biggest drawback of such studies is that their inability to link exposures to outcome in individuals (this phenomenon is called ecological fallacy and is defined as ascribing to the members of the group characteristics that they in fact do not posses as individuals) and to control the confounders