A group of 312 heart attack patients who were regular smokers up to the time of their heart attacks were followed for ten years. Among them, 150 patients continued to smoke after their heart attacks and 162 quit after their heart attacks.  Of the 150 patients that continued smoking, 54 had a second heart attack during the ten years of follow-up, and of the patients who quit, 28 had a second heart attack during the 10 years of follow-up.  Calculate the appropriate measure of association between continued smoking and second heart attack.

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A group of 312 heart attack patients who were regular smokers up to the time of their heart attacks were followed for ten years. Among them, 150 patients continued to smoke after their heart attacks and 162 quit after their heart attacks.  Of the 150 patients that continued smoking, 54 had a second heart attack during the ten years of follow-up, and of the patients who quit, 28 had a second heart attack during the 10 years of follow-up. 

Calculate the appropriate measure of association between continued smoking and second heart attack.

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