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5. Out of a group of 400 smokers, 23 develop lung cancer over 20 years. in a group of 2600 nonsmokers. 63 develop lung cancer over 20 years. What is the risk difference (RD) of developing bladder cancer for smokers compared to nonsmokers? Which is the appropriate interpretation of the risk dierence? ll b) cl dl cl 33.17; 33.17% of lung cancer diagnoses in this sample of 3000 people were In smokers. 33.11; There was an excess of 33.1? cases per 1000 people of lung cancer in the smoking population. 24.33; There was an excess of 24.33 cases per 1000 people of lung cancer in the smoking I - population. 3 24.33: 24.33% of lung cancer diagnoses in this sample of 3000 people were In nonsmokers. :1 24.33; 24.33% of lung cancer diagnoses in this sample of 3000 people were In smokers. _' {Ea I ll