NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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How is risk calculated?

Number of subjects with unfavorable event/total number of subjects in group
Total number of subjects in group/Number of subjects with unfavorable event
Number of subjects without unfavorable event/total number of subjects in group
Total number of subjects in group/Number of subjects without unfavorable event

The correct answer is: Number of subjects with unfavorable event/total number of subjects in group

Risk is calculated as the number of subjects with an unfavorable event divided by the total number of subjects in the group. This represents the proportion of individuals who experienced an unfavorable event within the group. The other options, B, C, and D do not accurately calculate risk because they either do not consider the presence of an unfavorable event or the number of subjects without an unfavorable event. Option B does not account for the number of subjects with the event, option C only considers the number of subjects without the event, and option D does not include the number of subjects with the event. Therefore, option A is the best and most accurate way to calculate risk.