Question

Confounding: A cohort study is conducted to assess the relationship between smoking and esophageal cancer. Cancer...

  1. Confounding: A cohort study is conducted to assess the relationship between smoking and esophageal cancer.

Cancer

No Cancer

Total

Smoker

110

140

250

Not a smoker

30

220

250

Total

140

360

500

  1. Researchers are concerned that alcohol consumption may be a confounder. So they separated the data based on the present of the third variable, alcohol to get the data below. Comparing the RR obtained from the CMH method to the crude RR (calculated using the first table). Is the following statement true or false based on your comparison? “Alcohol is not a confounder.”

Alcohol

Cancer

No Cancer

Total

No Alcohol

Cancer

No Cancer

Total

Smoker

100

50

150

Smoker

45

55

100

Not a smoker

15

185

200

Not a smoker

15

35

50

Total

115

235

350

Total

60

90

150

  1. True
  2. False

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