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Re: st: bug in charlson.ado program


From   selena@pharmacy.arizona.edu
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: bug in charlson.ado program
Date   Thu, 12 Nov 2009 09:15:18 -0700

Thanks!

> ...
>
> A few days ago a question came up regarding the user-written -charlson-
> program and I indicated that there was a bug in this program.
>
> The following code is at line 379 in charlson.ado:
>
>   forvalues i=1/17 {
>     gen weightch`i'=0
>     quietly replace weightch`i'=1 if ynch`i'==1
>     }
>
> *Change weights for more serious comorbidites (for calculation of
> charlson index, based on sum of weights)
>
>   quietly replace weightch12=2 if ynch12>0
>   quietly replace weightch13=2 if ynch13>0
>   quietly replace weightch14=2 if ynch14>0
>   quietly replace weightch15=3 if ynch15>0
>   quietly replace weightch16=6 if ynch16>0
>   quietly replace weightch17=6 if ynch17>0
>
> This block of code assigns weights to diagnoses flagged by the Charlson
> program.  There are 17 comorbidities (ynch1 to ynch17) and if these are
> flagged then the weights are set to 1 initially in the -forvalues- loop.
>
> More serious comorbidities are weighted more heavily and this is done in
> the lines that follow the -forvalues- loop.
>
> So this code would assign a weight of 1 to any of the first 11
> comorbidities (ynch1 to ynch11) and higher weights to the remaining 6
> comorbidities (ynch12 to ynch17).
>
> Now the problem is that ynch11 is "Diabetes with complications" and in
> the Charlson weighting scheme this should receive a weight of 2, but in
> the code above it receives a weight of 1.
>
> So an extra line is needed:
>   quietly replace weightch11=2 if ynch11>0
>
> This was discovered by some of my colleagues (Janine Calver and Zoe
> Hyde) some time ago and they did contact the author of charlson.ado, but
> the correction has not appeared (yet).
>
>
>
>
>
> ______________________________________________
> Kieran McCaul MPH PhD
> WA Centre for Health & Ageing (M573)
> University of Western Australia
> Level 6, Ainslie House
> 48 Murray St
> Perth 6000
> Phone: (08) 9224-2701
> Fax: (08) 9224 8009
> email: Kieran.McCaul@uwa.edu.au
> http://myprofile.cos.com/mccaul
> http://www.researcherid.com/rid/B-8751-2008
> ______________________________________________
> If you live to be one hundred, you've got it made.
> Very few people die past that age - George Burns
>
>
>
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