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[See Solution] A case control study was done to investigate the association between tuberculosis and heavy smoking in a particular population. One question

Question: A case control study was done to investigate the association between tuberculosis and heavy smoking in a particular population.  One question that arose was whether or not there was an interaction between age and smoking with respect to tuberculosis - that is, does the risk of tuberculosis due to smoking increase in older patients?  The following data are available:

AGE NUMBER OF
CASES 		PERCENT
HEAVY SMOKERS 		NUMBER OF
CONTROLS 		PERCENT
HEAVY SMOKERS
39 OR LESS
50 OR MORE 		221
165 		48.3%
51.0% 		136
162 		46.0%
40.1%
  1. What is the association between smoking and tuberculosis among those aged 39 or less?  What is the association between smoking and tuberculosis among those aged 50 or more?
  2. Is there a significant difference between the two age groups with respect to the association between smoking and tuberculosis?  Justify your answer.

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