Following data gives the relationship of lung cancer and exposure to cigarette smoke in obese and non-obese patients. Consider the data and solve the following:

i) Define Relative Risk (RR) and Odds Ratio (OR).

ii) Calculate the relative risk of diseased patients with respect to exposure of cigarette smoke in non obese and obese patients individually.

iii) Calculate the odds of “Not diseased” patients with respect to exposure of cigarette smoke in obese and non-obese patients individually.

i). Odds ratios (OR) are commonly reported in the medical literature as the measure of association between exposure and outcome. However, it is relative risk that people more intuitively understand as a measure of association. Relative risk can be __________ __________ _____ _____ _______ _________ _____ ___ __________.
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