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Researchers have been studying the association between cigarette smoking and caffeine intake and Parkinson's Disease for more...

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Statistics

Researchers have been studying the association betweencigarette smoking and caffeine intake and

Parkinson's Disease for more than 40 years. The resultsof a study by Checkoway et al. (2002) follow:

Ever having smoked cigarettes resulted with an oddsratio (OR) = 0.5 (95% confidence interval (CI):

0.4, 0.8).

The OR for current smokers was OR = 0.3 (95% CI: 0.1,0.7).

Among ex-smokers the OR = 0.6 (95% CI: 0.4,0.9).

Interpret the three ORs (in your ownwords).


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