Biology-Online • View topic - Odds Ratio??

## Odds Ratio??

Debate and discussion of any biological questions not pertaining to a particular topic.

Moderator: BioTeam

### Odds Ratio??

Hey,

I know the calculation for "odds ratio" is:
(A/B)
(C/D)

which is then rearranged to:
(AxD)
(BxC)

This is the question:
6) An epidemiological study is undertaken to examine the response of two groups of patients to a new drug
treatment. The results are summarised in the following data tables.

Patient group 1
Treatment-------14 -----------------------28
Placebo----------- 9------------------------29

Patient group 2
Treatment------ 16----------------------- 32
Placebo-----------7 ----------------------- 45

"(a) Calculate the odds ratios for treatment for both of patient groups 1 and 2.

(b) Calculate odds ratio for treatment on aggregated data (i.e. both patient groups combined)"

For (a) I applied the formula and got "1" which seems right, because all the research done say's so lol.

For (b) I am stuck, because I don't understand how I would come about placing the numbers into the equation. I have done two equations and both of them I recieved okay numbers (i.e one number above 1 and one under 1) whih is expected but the mthod used is different. I just don't know what to do Can anyone please help?

Love, Peace & Freedom..
TwinkleK
Garter

Posts: 18
Joined: Sat Jan 14, 2012 3:51 pm

Anyone?
Love, Peace & Freedom..
TwinkleK
Garter

Posts: 18
Joined: Sat Jan 14, 2012 3:51 pm