A Study Examines the Association Between Benzodiazepine Use and Hip

A study examines the association between benzodiazepine use and hip fracture in elderly patients >70 years of age.  A total of 180 patients admitted to 20 hospitals with hip fracture were included in the analysis; 10 patients used benzodiazepines in the week before admission.  For comparison, the investigators selected 200 patients who were admitted for a different reason; 7 of them used benzodiazepines in the week before admission.  Which of the following is the best measure of association to be reported for this study?

A) (10 / 180) / (7 / 200)
B) (10 *193) / (7 * 170)
C) (10 / 170) − (7 / 193)
D) (10 * 200) / (7 * 180)
E) (10 + 7) / (180 + 200)

Correct Answer:

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