Calculating the chance of survival? - USMLE Forums
 USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
 Home USMLE Articles USMLE News USMLE Polls USMLE Books USMLE Apps
 USMLE Forums Calculating the chance of survival?
 Register FAQs Members List Search Today's Posts Mark Forums Read

 USMLE Step 1 Forum USMLE Step 1 Discussion Forum: Let's talk about anything related to USMLE Step 1 exam

#1
04-29-2012
 USMLE Forums Guru Steps History: 1+CK+CS Posts: 333 Threads: 162 Thanked 284 Times in 147 Posts Reputation: 294
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%

#2
04-29-2012
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 1,684 Threads: 213 Thanked 1,600 Times in 660 Posts Reputation: 1610

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

This is a good question .... I hate such questions.
#3
04-29-2012
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 1,353 Threads: 94 Thanked 877 Times in 507 Posts Reputation: 890

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?
__________________
Ambition is a dream with a V8 engine. EP

#4
04-29-2012
 USMLE Forums Guru Steps History: Not yet Posts: 375 Threads: 17 Thanked 131 Times in 81 Posts Reputation: 147

27 % ... Not sure .

lol , thats not even an option.:P
#5
04-29-2012
 USMLE Forums Addict Steps History: Not yet Posts: 135 Threads: 3 Thanked 73 Times in 48 Posts Reputation: 83

Should be 45 %
#6
04-29-2012
 USMLE Forums Guru Steps History: Not yet Posts: 414 Threads: 30 Thanked 87 Times in 70 Posts Reputation: 97

should be more than 45 % and less than 75 %

hmmmm 60 %

no need to calculate this one came straight from kaplan
__________________
There is no shortcut to SUCCESS ,and there is no excuse for FALIURE - by Kabutar111
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
#7
04-30-2012
 USMLE Forums Veteran Steps History: 1+CK+CS Posts: 257 Threads: 49 Thanked 75 Times in 50 Posts

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%
 The above post was thanked by: Casandra (04-30-2012), Evergreen (04-30-2012), Hope2Pass (04-30-2012)
#8
04-30-2012
 USMLE Forums Guru Steps History: Not yet Posts: 414 Threads: 30 Thanked 87 Times in 70 Posts Reputation: 97

Quote:
 Originally Posted by vna.rao22 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
__________________
There is no shortcut to SUCCESS ,and there is no excuse for FALIURE - by Kabutar111
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
 The above post was thanked by: DocSikorski (04-30-2012), Evergreen (04-30-2012), Hope2Pass (04-30-2012)
#9
04-30-2012
 USMLE Forums Guru Steps History: 1+CK+CS Posts: 333 Threads: 162 Thanked 284 Times in 147 Posts Reputation: 294

Quote:
 Originally Posted by vna.rao22 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!

 Tags Biostatistics-Epidemiology, Step-1-Questions

Message:
Options

## Register Now

In order to be able to post messages on the USMLE Forums forums, you must first register.
User Name:
Medical School
Choose "---" if you don't want to tell. AMG for US & Canadian medical schools. IMG for all other medical schools.
 AMG IMG ---
USMLE Steps History
What steps finished! Example: 1+CK+CS+3 = Passed Step 1, Step 2 CK, Step 2 CS, and Step 3.

Choose "---" if you don't want to tell.

 Not yet Step 1 Only CK Only CS Only 1 + CK 1 + CS 1+CK+CS CK+CS 1+CK+CS+3 ---
Favorite USMLE Books
 What USMLE books you really think are useful. Leave blank if you don't want to tell.
Location
 Where you live. Leave blank if you don't want to tell.

## Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.