n a clinical trial of 2120 subjects treated with a certain? drug, 29 reported he
ID: 3126864 • Letter: N
Question
n a clinical trial of
2120
subjects treated with a certain? drug,
29
reported headaches. In a control group of
1611
subjects given a? placebo,
27
reported headaches. Denoting the proportion of headaches in the treatment group by
pt
and denoting the proportion of headaches in the control? (placebo) group by
pc?,
the relative risk is
pt?/pc.
The relative risk is a measure of the strength of the effect of the drug treatment. Another such measure is the odds? ratio, which is the ratio of the odds in favor of a headache for the treatment group to the odds in favor of a headache for the control? (placebo) group, found by evaluating
Pt/(1Pt) over Pc/(1-Pc)
.
The relative risk and odds ratios are commonly used in medicine and epidemiological studies. Find the relative risk and odds ratio for the headache data. What do the results suggest about the risk of a headache from the drug? treatment?
Explanation / Answer
The following is the given informaiton :
Relative risk = (29/2110)/(27/1611) = 0.82
Odds ratio = (29/2081)/(27/1584) = 0.8176
The RR value is less than one, there is decreased risk for headache for treatment group
Present head ache Not present head ache Total Treatment Group 29 2081 2110 Control Group 27 1584 1611Related Questions
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