A study was done where the sale of anti-asthma drug was recorded and the number of deaths because of asthma was measured over a period of 15 years (1975-1990). This is which type of study.
A study was done where the sale of anti-asthma drug was recorded and the number of deaths because of asthma was measured over a period of 15 years (1975-1990). This is which type of study.
💡 Explanation
A study was done where the sale of anti-asthma drug was recorded and the number of deaths because of asthma was measured over a period of 15 years (1975-1990). This is which type of study.
✓ Correct Answer: A. Ecological
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