Question

Case control study on a disease yields the following results:
Disease
Treatment
Yes
No
Yes
130
115
No
120
135
What is the Odds ratio?
a)
b)
c)
0.9228
1.2717
1.0048
0.7863​

Answer 1

B ) 1:2717 is the odd ratio

Answer 2

Answer:

1.2717

Step-by-step explanation:

Odds Ratio = (odds of the event in the exposed group) / (odds of the event in the non-exposed group)

If the data is set up in a 2 x 2 table as shown in the figure then the odds ratio is (a/b) / (c/d) = ad/bc. The following is an example to demonstrate calculating the odds ratio (OR).

$Odds\; ratio = \dfrac{130 \times 135}{115 \times 120} = 1.2717$

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