# Table 2 shows the frequency distribution of male cases and controls by average number of cigarettes...

###### Question:

Table 2 shows the frequency distribution of male cases and controls by average number of cigarettes smoked per day.

Table 2. Most recent amount of cigarettes smoked daily before onset of the present illness, lung cancer cases and matched controls with other diseases, Great Britain, 1948-1952.

Daily number of cigarettes  Cases  Controls Odds Ratio

 0 8 68 referent 1-14 622 785 15-24 498 482 25+ 402 195 All smokers 1,522 1,462 Total 1,530 1,530

***Question 11: Compute the odds ratio by category of daily cigarette consumption, comparing each smoking category to nonsmokers??

11. HINT You'll end up with 4 Odds Ratios on this one. One for each dosage of cigarettes (1-14; 15-24; 25+; and ALL). These are NOT age categories; they are dosage ( of cigarettes smoked/day). Set up your 2x2 table for each category. Your 'no exposure' row (0 cigarettes) will be the same for all the 2x2 tables.

*****Question 12: From Question 11; what does these results tell you? HINT: Look at the 4 different ORs and note any differences by dosage. Is there a dose-response relationship between exposure ( of cigarettes smoked) and disease (lung cancer)?

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