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***cross-posted***

Hello, again.  This is a separate post from the 5 and 20 calculators posting.  

Here's a few more calculators to add to my February summary on EBM calculators:

MedCalc has a calculator called: Confidence Interval of a Difference Between Proportions;   the Example for this application is Calculations of Absolute Risk Reduction, etc..  From their homepage: http://medcalc3000.com/
if you do a search on their hompage with the terms "confidence interval" (without quotes) this calculator appears, but it is grayed out, so I am assuming that you must purchase.  
Maybe you have Stat!Ref, like we do, where MedCalc3000 is part of our subscription:
http://online.statref.com/MedCalc3000.aspx?SessionId=3FE530ISMTDZMVMJ

Came across this site a while back and I've used it often...it seems to calculate pretty much everything possible from a 2x2 table with the CI that you specify.  http://members.aol.com/johnp71/ctab2x2.html

http://faculty.vassar.edu/lowry/clin1.html  Carefully note that the Absent/Present labels are listed in a different order than in many 2 by 2 tables.

And for all the tables, note whether you're expected to plug in decimals or percentages.

Please feel free to pass this along.

Take care,

Tanya

Tanya Feddern, MLIS, AHIP, MOT, OTR/L
http://www.geocities.com/nqiya/EBMbib.html
http://www.geocities.com/nqiya/index.html
Evidence-Based Medicine Assistant Professor; Reference & Education Services Librarian 
University of Miami Leonard M. Miller School of Medicine, Louis Calder Memorial Library



-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]On
Behalf Of Feddern, Tanya
Sent: Thursday, February 24, 2005 5:04 PM
To: AliaHEALTH; Canmedlib; Evidence-based health; IHSLG; medlib;
MLA-EBHC
Cc: Irish Health Sciences Librarians Group (E-mail)
Subject: Summary: EBM Calculators: Urgent EBM question--please help!


Hello, everyone.  As you can tell, this is my summary catch-up day.  Here's a list of the suggested EBM calculators.  Thank you again, everyone, for helping me.  You all are *great*!  :)

BTW, when plugging in the data, pay attention to whether the calculator is asking for the number or the percent.

http://www.cebm.utoronto.ca/practise/ca/statscal/ (has the most EBM calculators, including the RR)

http://araw.mede.uic.edu/~alansz/tools.html

http://www.hutchon.net/ConfidOR.htm

http://www.graphpad.com/quickcalcs/index.cfm  

Please feel free to forward this email.  

P.S.  I may have an answer to my December post on looking for "Online calculator for 5 & 20 followup rule & sensitivity analysis"--I will post additional information by next week.

Take care,

Tanya

Tanya Feddern, MLIS, AHIP, MOT, OTR/L
http://www.geocities.com/nqiya/EBMbib.html
http://www.geocities.com/nqiya/index.html
Evidence-Based Medicine Assistant Professor; Reference & Education Services Librarian 
University of Miami Leonard M. Miller School of Medicine, Louis Calder Memorial Library

> -----Original Message-----
> From: Medical Libraries Discussion List 
> [mailto:[log in to unmask]] On Behalf Of Feddern, Tanya
> Sent: Monday, January 31, 2005 10:51 PM
> To: [log in to unmask]
> Subject: Urgent EBM question--please help!
> 
> 
> ***cross-posted***
> 
> Hello, everyone.  Please, I need your help.  This site is 
> good for getting the CI for NNT, NNH, and Sensitivity and 
> Specificity: http://araw.mede.uic.edu/~alansz/tools.html  
> This site is good for getting the CI for NNT and calculating 
> the CI for a proportion, which you might do for a prognosis 
> study: http://www.graphpad.com/quickcalcs/index.cfm  This 
> site is good for calculating OR and its CI: 
> http://www.hutchon.net/ConfidOR.htm  But I can't find an 
> online calculator for RR *and* its CI.  If anyone knows of 
> one that's easy to use, please let me know.
> 
> CI- Confidence Interval; NNT- Number Needed to Treat; NNH- 
> Number Needed to Harm; OR- Odds Ratio; RR- Relative Risk
> 
> Take care,
> 
> Tanya
> Tanya Feddern, MLIS, AHIP, MOT, OTR/L
> http://www.geocities.com/nqiya/EBMbib.html
> http://www.geocities.com/nqiya/index.html
> Evidence-Based Medicine Assistant Professor; Reference & 
> Education Services Librarian 
> University of Miami Leonard M. Miller School of Medicine, 
> Louis Calder Memorial Library
>