Question: Which Of The Following Groups Would You Recruit For A Prospective Cohort Study To Assess The Association Between Cigarette Smoking And Parkinson’s Disease? Patients Diagnosed With Parkinson’s Disease And Healthy Controls Healthy Smokers And Patients Diagnosed With Parkinson’s Disease Who Smoke Healthy Smokers And Healthy Non-smokers Patients Diagnosed ...

Which of the following groups would you recruit for aprospective cohort study to assess the associationbetween cigarette smoking and Parkinson’s disease?

		Patients diagnosed with Parkinson’s disease and healthycontrols
		Healthy smokers and patients diagnosed with Parkinson’s diseasewho smoke
		Healthy smokers and healthy non-smokers
		Patients diagnosed with Parkinson’s disease who smoke andpatients diagnosed with Parkinson’s disease who do not smoke

What variable differentially (positively and negatively)modifies the observed effect of a risk factor on disease status?Different groups will have different risk estimates when present.The effect is real, but the magnitude of the effect is differentfor different groups of individuals.

		Effect Modification
		Confounder
		Random Error
		Bias

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