Question:
A cohort study was conducted with drinkers and non-drinkers of green tea to study its effect ondiabetes mellitus. The risk ratio was found to be 0.84. Which of the following statements is correct?
A cohort study was conducted with drinkers and non-drinkers of green tea to study its effect ondiabetes mellitus. The risk ratio was found to be 0.84. Which of the following statements is correct?
Updated On: Jun 18, 2025
- Green tea reduces the risk of diabetes
- Green tea increases the risk of diabetes
- Data insufficient to establish causal association
- The value (0.85) tends to be close to 41, hence there is no effect
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The Correct Option is D
Solution and Explanation
A cohort study compared the incidence of diabetes mellitus between drinkers and non-drinkers of green tea. The study calculated a risk ratio (RR) of 0.84 for developing diabetes among green tea drinkers compared to non-drinkers. To interpret this value, it's important to understand:
- Risk Ratio (RR): This measure compares the risk of a certain event (e.g., developing diabetes) between two groups. An RR of 1 indicates no difference in risk; less than 1 suggests a reduction in risk, while greater than 1 implies an increased risk.
Given the RR of 0.84:
- Interpretation: An RR of 0.84 suggests a 16% reduction in risk (1 - 0.84 = 0.16 or 16%) of developing diabetes for green tea drinkers compared to non-drinkers.
Reviewing the options:
| Option | Interpretation |
| Green tea reduces the risk of diabetes | Correct interpretation according to RR value |
| Green tea increases the risk of diabetes | Incorrect, as RR < 1 |
| Data insufficient to establish causal association | Possibly true, but not directly linked to RR |
| The value (0.85) tends to be close to 41, hence there is no effect | Confusing and incorrect |
The correct statement based on RR interpretation is: Green tea reduces the risk of diabetes, as indicated by the RR of 0.84, meaning it suggests a risk reduction not an increase or lack of effect.
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