Negative predictive value

Prep for USMLE Forum

» Log in | Register

Forum

Step 1

Match

Prep4USMLE Forum » USMLE Step 2 CK Forum » Preventive Medicine

Negative predictive value

Author

7 Posts

ARJ
Forum Guru
avatar

Topics: 133
Posts: 792

10/06/05 - 08:46 AM

If Prevalence goes up then Negative predictive value goes Up or down???????????????

Aray yaar confuse rolling eyes

Plz Help

___________________
"Live as if you were to die tomorrow. Learn as if you were to live forever." --Mahatma Gandhi

drkpp
Forum Guru
avatar

Topics: 45
Posts: 882

10/06/05 - 10:07 AM

goes down.

if more pple have disease that means less chances of finding a truely negative person....

___________________
"Where there is a will there is a way!"
-Anonymous

ARJ
Forum Guru
avatar

Topics: 133
Posts: 792

10/06/05 - 12:06 PM

thanks got itttttttttttttttt nod

___________________
"Live as if you were to die tomorrow. Learn as if you were to live forever." --Mahatma Gandhi

alenka
Forum Elite
avatar

Topics: 22
Posts: 330

10/06/05 - 02:40 PM

thanks

phuluong2k
Forum Fanatic
avatar

Topics: 714
Posts: 2,008

10/07/05 - 06:25 AM

My mnemonic

Prevalence goes up ----- Positive predictive goes up, ( NPV is the opposition)

frank100
Forum Guru

Topics: 48
Posts: 586

08/11/06 - 03:00 PM

prevelnce=all the cases go up-------------------PPV goes up

dipsite
Forum Newbie

Topics: 1
Posts: 26

12/23/06 - 07:19 AM

Let Me ADD some Info on it:-
Sensitivity and Specificity Of a Test Remain The same.lets say if the prevalence of a disease goes up then PPV goes up,NPV goes down BUT sensitivity and specificity remain the same just because sensitivity and specificity of a test remain the same irrespective of prevalence...
Reference:-High Yield Biostatistics..(A Very Good Book FOr Biostatistics) Even I Read the same in my third year.

___________________
Destiny is no matter of chance,it is a matter of choice,it is not a thing to be waited for , it is a thing to be achieved.

You don't have permission to post.