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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 > > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: bug in charlson.ado program***From:*"Kieran McCaul" <Kieran.McCaul@uwa.edu.au>

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