What type of bias... please explain..confusing.. - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
Home
USMLE Articles
USMLE News
USMLE Polls
USMLE Books
USMLE Apps
Go Back   USMLE Forums > USMLE Step 2 CK Forum

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


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 06-14-2012
tyagee's Avatar
USMLE Forums Master
 
Steps History: ---
Posts: 1,365
Threads: 648
Thanked 591 Times in 355 Posts
Reputation: 601
Stats What type of bias... please explain..confusing..

Alcohol consumption and cigarette smoking both contribute causally to the occurrence of
esophageal cancer. These risk factors are not independent; in fact, they operate synergistically.
A study of cigarette smoking in relation to esophageal cancer that fails to stratify or otherwise
control for level of alcohol consumption would be guilty of which of the following threats to
validity?
A. Ascertainment bias
B. Confounding
c. Design bias
D. Lead time bias
E. Observer bias
F. Recall bias
G. Response bias
H. Selection bias
Reply With Quote Quick reply to this message



  #2  
Old 06-14-2012
USMLE Forums Addict
 
Steps History: 1+CK+CS+3
Posts: 178
Threads: 8
Thanked 100 Times in 54 Posts
Reputation: 110
Default

i would say confouding bias because alcohol can also cause oesophagial cancer thus the effect of smoking wasn't measured alone but rather with a (co-factor) sort of speaking. this makes the results of the study inaccurate since the "pure" effect of smoking wan't measured.
Reply With Quote Quick reply to this message
  #3  
Old 06-14-2012
K06100's Avatar
USMLE Forums Master
 
Steps History: 1+CK+CS+3
Posts: 730
Threads: 90
Thanked 460 Times in 289 Posts
Reputation: 470
Default

Quote:
Originally Posted by tyagee View Post
Alcohol consumption and cigarette smoking both contribute causally to the occurrence of
esophageal cancer. These risk factors are not independent; in fact, they operate synergistically.
A study of cigarette smoking in relation to esophageal cancer that fails to stratify or otherwise
control for level of alcohol consumption would be guilty of which of the following threats to
validity?
A. Ascertainment bias
B. Confounding
c. Design bias
D. Lead time bias
E. Observer bias
F. Recall bias
G. Response bias
H. Selection bias
B........???if we measure relation of alcohol with cancer then smoking is the confounding factor...similarly if we measure relation of smoking with cancer then alcohol is the confounding factor.....since both operate synergistically to cause cancer,thus effect of one factor on cancer will not correctly show results of study and thus confounding bias will exist.......
__________________
Try Not To Become A Man Of Success But A Man Of Value.
Reply With Quote Quick reply to this message



Reply

Tags
Biostatistics-Epidemiology, Step-2-Questions

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the USMLE Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Medical School
Choose "---" if you don't want to tell. AMG for US & Canadian medical schools. IMG for all other medical schools.
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.

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.



Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
What type of bias is this? Evergreen USMLE Step 1 Forum 11 04-30-2012 01:38 PM
sampling bias n selection bias??! numbndumb USMLE Step 1 Forum 1 03-25-2012 01:51 AM
What type of Bias! usmle2011 USMLE Step 1 Forum 4 10-29-2011 09:08 AM
Study subjects and changing the working light brightness! Type of bias rulz USMLE Step 1 Forum 2 09-06-2011 07:17 AM
can anyone explain difference between T type and L type calcium channel??? dr.digant USMLE Step 1 Forum 1 07-23-2011 05:14 AM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

USMLE® & other trade marks belong to their respective owners, read full disclaimer
USMLE Forums created under Creative Commons 3.0 License. (2009-2014)