USMLE Forums

USMLE Forums (https://www.usmle-forums.com/)
-   USMLE Step 1 Forum (https://www.usmle-forums.com/usmle-step-1-forum/)
-   -   Calculating the chance of survival? (https://www.usmle-forums.com/usmle-step-1-forum/26537-calculating-chance-survival.html)

Evergreen 04-29-2012 05:08 PM

Calculating the chance of survival?
 
If the chance of surviving for 5 years after being diagnosed with colorectal cancer is 45% and the chance of surviving for 2 years after diagnosis is 75%, what is the chance of surviving for 5 years after diagnosis, given that the patients is alive at the end of the second year?

A) 15%
B) 30%
C) 45%
D) 60%
E) 75%

Hope2Pass 04-29-2012 06:19 PM

B) 30% ... not too sure though ?


This is a good question .... I hate such questions.

DocSikorski 04-29-2012 06:31 PM

wait, this wording is kinda weird,
is it just asking the same thing. "what is the chance of surviving for 5 years"? its what, still 45?

Doc4Step1 04-29-2012 06:48 PM

27 % ... Not sure .:confused:

lol , thats not even an option.:P

slowpoke 04-29-2012 07:12 PM

Should be 45 %

Kabutar111 04-29-2012 07:45 PM

should be more than 45 % and less than 75 %

hmmmm :notsure::notsure: 60 %

no need to calculate this one came straight from kaplan

steps_8186 04-30-2012 07:49 AM

yeah straight from kaplan.
the no. of ppl surviving at the end of 2 yrs=75(out of 100)
the no. of ppl surviving for another 3 yrs(i.e 5 yrs) are a subset of this no. =45/75=60%

Kabutar111 04-30-2012 08:23 AM

Quote:

Originally Posted by vna.rao22 (Post 114976)
yeah straight from kaplan.
the no. of ppl surviving at the end of 2 yrs=75(out of 100)
the no. of ppl surviving for another 3 yrs(i.e 5 yrs) are a subset of this no. =45/75=60%

there is simple logic can be solved by
no need to calc
since already survived has to be more than 45 %
and since it can't be 75% as it is survival unto 2 years has to be less
so left with
ding dong 60%
this is how dr.D explain in video ;)

Evergreen 04-30-2012 09:28 AM

Answer
 
Quote:

Originally Posted by vna.rao22 (Post 114976)
yeah straight from kaplan.
the no. of ppl surviving at the end of 2 yrs=75(out of 100)
the no. of ppl surviving for another 3 yrs(i.e 5 yrs) are a subset of this no. =45/75=60%

Good job!
The answer is 60%.


All times are GMT -8. The time now is 10:28 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

USMLE® & other trade marks belong to their respective owners, read full disclaimer
USMLE Forums created under Creative Commons 3.0 License. (2009-2019)