need help with your account or subscription? click here to email us (or see the contact page)
join telegramNEW! discord
jump to exam page:
search for anything ⋅ score predictor (โ€œpredict me!โ€)
NBME Free 120 Answers

free120/Block 3/Question#19 (reveal difficulty score)
A randomized controlled trial is conducted to ...
0.2 ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
tags: biostats

 Login (or register) to see more

 +6  upvote downvote
submitted by โˆ—bwdc(697)

Absolute risk reduction is the decrease in the number affected per number exposed:

(15-5)/50 = 10/50 = 0.2

 Login (or register) to see more
tekkenman101  ARR = (c / c + d) -( a / a + b) +

 +0  upvote downvote
submitted by โˆ—handsome(3)

FA 2020 PG 258

Absolute risk reduction BY DEFINITION : The difference in risk (not the proportion) attributable to the intervention as compared to a control.

ARR = (c/c + d ) - ( a/ a + b )

I assumed c+d as 50 for azithromycin and a+b as 50 for erythromycin

= 15/50- 5/50 = .3 -.1 = .2

in FA the example is If 8% of people who receive a placebo vaccine develop the flu vs 2% of people who receive a flu vaccine, then ARR = 8%โ€“2% = 6% = 0.06.

 Login (or register) to see more

Must-See Comments from free120

sugaplum on It is a polymorphism
bwdc on Elaboration of proteases and urease with ...
bwdc on Hypercoagulability from advanced malignancy
bwdc on Ribosomal assembly
bwdc on Aspiration
bwdc on Amygdala
imnotarobotbut on von Willebrand disease
bwdc on Trinucleotide repeat expansion
bwdc on Mediation of cell entry via a fusion protein
bwdc on Metabolism
bwdc on Basement membrane
melchior on Aspiration
hungrybox on Immune complex deposition in tissues
aejinkim on Decreased activity in the enzyme that ...

search for anything NEW!