The Charlson Comorbidity Index - Text Mining Techniques for Healthcare Provider Quality Determination - page 158

4',diagnoses4digits)> 0 or
rxmatch('585',diagnoses3digits)> 0 or rxmatch('586',diagnoses3digits)> 0 or rxmatch('588',
diagnoses3digits)> 0 ) then rd= 1 ;
if (rxmatch('014',diagnoses3digits)> 0 or rxmatch('015',diagnoses3digits)> 0 or rxmatch('0
16',diagnoses3digits)> 0 or
rxmatch('018',diagnoses3digits)> 0 or rxmatch('170',diagnoses3digits)> 0 or rxmatch('171',
diagnoses3digits)> 0 or
rxmatch('172',diagnoses3digits)> 0 or rxmatch('174',diagnoses3digits)> 0 or rxmatch('175',
diagnoses3digits)> 0 or
rxmatch('176',diagnoses3digits)> 0 or rxmatch('179',diagnoses3digits)> 0 or rxmatch('190',
diagnoses3digits)> 0 or
rxmatch('191',diagnoses3digits)> 0 or rxmatch('192',diagnoses3digits)> 0 or rxmatch('193',
diagnoses3digits)> 0 or
rxmatch('194',diagnoses3digits)> 0 or rxmatch('1950',diagnoses4digits)> 0 or rxmatch('1951
',diagnoses4digits)> 0 or
rxmatch('1952',diagnoses4digits)> 0 or rxmatch('1953',diagnoses4digits)> 0 or rxmatch('195
4',diagnoses4digits)> 0 or
rxmatch('1955',diagnoses4digits)> 0 or rxmatch('1958',diagnoses4digits)> 0 or rxmatch('200
',diagnoses3digits)> 0 or
rxmatch('201',diagnoses3digits)> 0 or rxmatch('202',diagnoses3digits)> 0 or rxmatch('203',
diagnoses3digits)> 0 or
rxmatch('204',diagnoses3digits)> 0 or rxmatch('205',diagnoses3digits)> 0 or rxmatch('206',
diagnoses3digits)> 0 or
rxmatch('206',diagnoses3digits)> 0 or rxmatch('207',diagnoses3digits)> 0 or rxmatch('208',
diagnoses3digits)> 0 ) then cancer= 1 ;
if (rxmatch('196',diagnoses3digits)> 0 or rxmatch('197',diagnoses3digits)> 0 or rxmatch('1
98',diagnoses3digits)> 0 or
rxmatch('1990',diagnoses4digits)> 0 or rxmatch('1991',diagnoses4digits)> 0 ) then mc= 1 ;
if (rxmatch('5722',diagnoses4digits)> 0 or rxmatch('5723',diagnoses4digits)> 0 or rxmatch(
'5724',diagnoses4digits)> 0 or
rxmatch('5728',diagnoses4digits)> 0 ) then sld= 1 ;
if (rxmatch('042',diagnoses3digits)> 0 or rxmatch('043',diagnoses3digits)> 0 or rxmatch('0
44',diagnoses3digits)> 0 ) then hiv= 1 ;
Once the indicator functions are defined, the Charlson Index is defined as a sum of indicators times
weights.
charlson=ami+chf+pvd+cva+dementia+pd+ctd+pu+ld+diabetes+ 2 *(dc+paraplegia+rd+cancer)+ 3 *mc
+ 6 *(sld+hiv);
run ;
Given the weights for the index, those with a weight of one should have similar mortality rates, and
the mortality should increase with the weighting. Table 2 gives the mortality by Charlson Index. Table
3 gives the mortality by each of the 17 conditions.