nbme 17 q...2 - rvusmle2013

[ArchivalUser]

a randomized clinical trial is conducted to compare wound healing and cosmetic differences between two surgical procedures for closing skin wounds following cesarean delivery. a total of 500 women undergoing c-section during a 6-month period are enrolled in the study. a research asst is assigned to conduct outcome assessments of each participant at 2 wks and 6 wks following delivery. both procedures require the expertise of surgical specialists who cannot be blinded to the procedure. results show that procedure A has a lower rate of wound infection compared to procedure B (RR of 0.66 with a 95% CI of 0.30 - 1.45); the two procedures also have a similar cosmetic results 6 wks after delivery. which of the following statements most accurately represents the comparision between procedure A and procedure B in a clinial care setting?

a. neither procedure is superior
b. procedure A is superior to procedure B
c. procedure B is superior to procedure A
d. the two procedure should not be used in a clinical care setting.

[ArchivalUser]

I got it right is not within my wrongs but not remember exactly mu answ, but as CI invludes 1, does not have signific, thus maybe I choosed D

[ArchivalUser]

it WILL be statistically significant if CI for RR includes 1 (null hypothesis not rejected)

[ArchivalUser]

if CL includes 1 it will NOT be significant. so yes ans is D i think

[ArchivalUser]

oh im sorry. i had it wrong in my head.
thank you!

[ArchivalUser]

its A

[ArchivalUser]

A

CI crosses 1 for RR (so, b and c out)
for choice d -- there is nothing in the q stating that these procedures are dangerous, etc...