Prevalence, Sensitivity, Specificity Biostat Question! - USMLE Forums
 USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
 Home USMLE Articles USMLE News USMLE Polls USMLE Books USMLE Apps
 USMLE Forums Prevalence, Sensitivity, Specificity Biostat Question!
 Register FAQs Members List Search Today's Posts Mark Forums Read

 USMLE Step 2 CK Forum USMLE Step 2 CK Discussion Forum: Let's talk about anything related to USMLE Step 2 CK exam

#1
07-31-2012
 USMLE Forums Master Steps History: Step 1 Only Posts: 537 Threads: 80 Thanked 345 Times in 138 Posts Reputation: 377
Prevalence, Sensitivity, Specificity Biostat Question!

A 55 yo man visits his primary care physician with .................................PSA is 7ng/ml. A recently published article found 10 percent of men in his age group have prostate cancer. sensitivity 80% specificity 90% what is your best estimate of the likelihood that this man actually has prostate ca?

a) 13%
b) 25%
c) 36%
d) 47%
e) 58%
f) 69%
g) 72%
h) 81%

please explain me in detail ..

#2
07-31-2012
 USMLE Forums Scout Steps History: Step 1 Only Posts: 50 Threads: 5 Thanked 59 Times in 23 Posts Reputation: 69

This question was discussed before here
Calculating the Positive Predictive Value?
 The above post was thanked by: sonu.agarwall (07-31-2012)

 Tags Biostatistics-Epidemiology, Step-2-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.