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NBME 23 Answers

nbme23/Block 4/Question#10

A study was conducted to investigate the mean age ...

99%

A study was conducted to investigate the mean age ...

99%

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d_holles
dude i almost didn't get the question bc of this ... i thought the age of onset was the actual age of onset (36)
+3

Why is it 99% and not 95%? It asked for onset of disease at less than 9 years of age. I'm clearly missing something here

cbrodo
@fulminant_life because the mean age is 3.8 with a standard deviation of 1.8. An age of onset of 9 years is nearly 3 standard deviations above the mean. Therefore, since we know +/- 2 SD covers 95% of the bell curve, it must be higher than that. The only option higher than 95% is 99%.
+5

charcot_bouchard
Yes 9.2 was the upper limit for 99% CI. I picked 95 first because i thought 2.5% would be out of this range. But changed ans because it should be less than 2.5% because 9.2 is so close to 9. Also they are asking CLOSEST to which of the following?
+

submitted by yotsubato(217), 2019-06-16T11:56:44Z

Was it just me, or did "age at onset in years" appear RIGHT above the number of patients, rather than the mean. Which confused me for a good 3 minutes.