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Retired NBME Step 2 CK Free 120 Answers

step2ck_free120/Block 1/Question#11 (reveal difficulty score)
A 52-year-old man with hepatic cirrhosis ...
5 (five) ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
tags: biostats

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submitted by โˆ—bwdc(697)
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We have event rates of 35% for EST and 15% for EPCS, and the number needed to treat (NNT) is the inverse of the absolute risk reduction or 1/ARR. ARR = Control event rate minus experiment event rate. So, we have ARR = 0.35 โ€“ 0.15 = 0.2, and therefore NNT = 1/0.2 = 5. Boom, math.

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