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Table 1. Smoking status before onset of the present illness, lung cancer cases and matched controls with other diseases,...

Table 1. Smoking status before onset of the present illness, lung cancer cases and matched controls with other diseases, Great Britain, 1948-1952.

Cases

Controls

Cigarette smoker

1,350

1,296

Non-Smoker

7

61

Total

1,357

1,357

Question 11 (2 points) Calculate the odds of smoking among the cases.

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Answer #1

Cigarette smoker cases = 1,350

Total Cases= 1,357

Odds ratio = probability/ (1-probability) = proportion /(1-proportion)

(1,350/1,357) / (7/1,357) = 1,350/7 = 192.9:1

According to the given case group patients would smoke 193 times probably.

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