A case-control study was conducted in Minnesota to study the association between

Question

A case-control study was conducted in Minnesota to study the association between drinking soda and diabetes. The study reported an odds ratio of 1.9 for diabetes among subjects who drank more than 1L soda per week (the exposed group) compared to those who did not drink soda (the reference group). The 95% confidence interval for this odds ratio was (0.7-4.6) and the p-value was 0.11.

Interpret the odds ratio

Interpret the 95% confidence interval

Is this a wide or narrow confidence interval?

Interpret the p-value

Explanation / Answer

Result:

A case-control study was conducted in Minnesota to study the association between drinking soda and diabetes. The study reported an odds ratio of 1.9 for diabetes among subjects who drank more than 1L soda per week (the exposed group) compared to those who did not drink soda (the reference group). The 95% confidence interval for this odds ratio was (0.7-4.6) and the p-value was 0.11.

Interpret the odds ratio

There is risk of 1.9 times more for diabetes among subjects who drank more than 1L soda per week (the exposed group) compared to those who did not drink soda.

Interpret the 95% confidence interval

We are 95% confident that odds ratio for all diabetes among subjects who drank more than 1L soda per week (the exposed group) compared to those who did not drink soda fall between (0.7 , 4.6).

If the confidence interval contains the value 1, (0.7, 4.6), this means there is no difference between the two groups..

Is this a wide or narrow confidence interval?

The width is about 3.9 which is narrow.

Interpret the p-value

P value =0.11 which is > 0.05 level of significance. This result was statistically not significant.

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