Including Age in Scoring

[whninrome81]

I am running {icd} over some billing/coding data locally and noticed the scores were lower than expected (whereas the van Walraven scores were in line with what was expected). I believe Charlson-Deyo uses binned age in its scoring algorithm correct? Is this implemented in the icd package in any way, or am I missing validation of this score in the absence of age?

I am new to comorbidity index calculations, so thanks for your insight in this. Thank you!

[jackwasey]

Thanks for raising the issue. There is a subtle distinction between Charlson Score and Risk Index, see Charlson ME, Pompei P, Ales KL, MacKenzie CR: A new method of classifying prognostic comorbidity in longitudinal studies: Development and validation. Journal of Chronic Diseases 1987; 40:373–83

To get the risk index, it is straightforward to get the Charlson score, then bucket the age and add 0 (<40) 1 (40-50) etc, but icd doesn't currently do this. Would love a pull request!