NBME 12: Biostatistics - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
USMLE Articles
Go Back   USMLE Forums > USMLE Step 1 Forum

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

Thread Tools Search this Thread Display Modes
Old 07-11-2014
USMLE Forums Addict
Steps History: 1+CK+CS
Posts: 148
Threads: 37
Thanked 73 Times in 57 Posts
Reputation: 83
Default NBME 12: Biostatistics

In a historical study,4753 nulliparous women were randomized into folic acid supplementation and trace element supplementation.In both the groups,88% of the women had their pregnancy ending in live birth,still birth,late fetal death and termination of pregnancy after prenatal diagnosis of the defect.Following were the outcome of the study

Drug given Folic Acid Trace Elements

Neural tube defects 0% 0.29%

All other congential
anomalies 1.3% 2.3%

Based on the data with trace elements group as the control group How many nulliparous women with confirmed pregnancy would have to be treated with folic acid inorder to prevent one child with congenital anomaly?


Can someone help me with this question???
Reply With Quote Quick reply to this message

Old 07-11-2014
USMLE Forums Veteran
Steps History: Not yet
Posts: 211
Threads: 12
Thanked 107 Times in 68 Posts
Reputation: 117


it is pretty simple actually altough it seems very tough. The question baically asks number needed to treat which is 1/ABsolute risk reduction.

So in this question the risk of developing congenital anomaly reduces from %2.3 to %1.3 when we give folic acid supplementation. so the difference is %1. 1/%1=100
Reply With Quote Quick reply to this message
The above post was thanked by:
hope2015 (07-12-2014), neelima208 (07-12-2014)


Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
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.
Where you live. Leave blank if you don't want to tell.


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
biostatistics question obinocle USMLE Step 2 CK Forum 2 01-31-2014 04:57 PM
Looking for Step 1 Partner in Online/biostatistics !; Exam: Soon ! / biostatistics dede USMLE Step 1 Study Partners 0 03-16-2013 04:49 AM
Biostatistics Q.. obinocle USMLE Step 1 Forum 10 08-31-2012 07:55 AM
biostatistics rose USMLE Step 1 Forum 0 01-19-2012 12:25 PM
How much biostatistics on Step 1? heights USMLE Step 1 Forum 3 12-01-2010 09:16 AM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 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)