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You are reviewing the cost effectiveness of a new antibiotic for the treatment of otitis media, for which the manufacturer has applied for reimbursement in your hospital.

In a clinical study of 1000 patients treated with the agent, versus 1000 given standard of care, 50 given standard of care recovered by day three, versus 100 given the new agent.

Which of the following correctly represents the number needed to treat (NNT) with the new agent to allow one extra patient to recover by day three?

A.5
B.10
C.20
D.50
E.100

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