4 Compute and interpret the 95 confidence interval for the odds ratio that you

# 4 compute and interpret the 95 confidence interval

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4. Compute and interpret the 95% confidence interval for the odds ratio that you computed. ln ( ¿ ) =− 0.47 Var ( ln ( ¿ ) ) = 1 5 + 1 8 = 0.325 95% confidence interval for ln(ORmh) is 0.47 ± 1.96 × 0.325 =− 0.47 ± 1.11737 =(− 1.587,0.64737 ) 95% confidence interval for OR MH is e (− 1.587,0.64737 ) =( 0.2045,1.91 ) With 95% confidence, these data are consistent with OR ranging from 0.20 to 1.91 for the association between high caffeine intake compared to low caffeine intake and the odds of Parkinson’s disease, after accounting for the matching factors (smoking status and age), assuming no residual confounding by smoking status and age, no other unmeasured confounding, no selection bias and no information bias. 5. Suppose the investigators were interested in whether smoking modifies the association between caffeine intake and the incidenceofParkinson’sdisease.Could this be evaluated in these case-control data?

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• Summer '14
• FrancisCook

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