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Are comorbidity indices useful in predicting all-cause mortality in Type 2 diabetic patients? Comparison between
Matteo Monami1, Lorella Lambertucci, Caterina Lamanna
1Unit of Gerontology and Geriatrics, Department of Critical Care Medicine and Surgery, University of Firenze, Firenze, Italy. mmonami@libero.it
Insights
A simple disease count effectively predicts mortality in type 2 diabetes patients, similar to the Charlson Comorbidity Index. This finding offers a simpler approach for assessing risk in diabetic populations.
Area of Science:
- Endocrinology
- Gerontology
- Public Health
Background:
- Comorbidity significantly impacts general population morbidity and mortality.
- Limited research exists on comorbidity index validity specifically in diabetic patients.
- Predicting outcomes in type 2 diabetes (T2D) requires robust assessment tools.
Purpose of the Study:
- To compare the predictive accuracy of disease count versus Charlson's Comorbidity Index (CCI) for 3-year mortality in T2D patients.
- To evaluate the utility of simple comorbidity measures in a diabetic cohort.
Main Methods:
- A cohort of 1667 T2D outpatients was studied.
- Comorbidity was assessed using disease count and Charlson's index.
- All-cause mortality data were collected over a 3-year follow-up period.
Main Results:
- The 3-year mortality rate was 11.9% (4.7% yearly).
- Each additional disease independently increased mortality by 54%.
- Each CCI point increased mortality by 31%.
Conclusions:
- Disease count demonstrates comparable predictive value for mortality in T2D patients as the CCI.
- Simple comorbidity assessment is valuable in T2D outcome prediction.
- Further research is needed on specific comorbidity indices for predicting disability in diabetics.
Background And Aims:
Several studies have shown that comorbidity is important in predicting morbidity and mortality in the general population. However, few studies have assessed the validity of comorbidity indices in diabetic patients. The aim of the present study was to compare the predictive value of disease count and Charlson's Comorbidity Index (CCI) for 3-year mortality in type 2 diabetic (T2D) patients.
Methods:
The study was performed on a consecutive series of 1667 T2D outpatients. Comorbidity was assessed using Charlson's index, whereas the diseases used to calculate Charlson's score were taken into account for disease count. Information on all-cause mortality over the 3-year follow-up period was obtained from the City of Florence Registry Office.
Results:
Mean duration of follow-up (+/-SD) was 31.4+/-10.6 months. One hundred and ninety-nine (11.9%) patients died during follow-up, with a yearly mortality rate of 4.7%. At multivariate analysis, after adjustment for sex and age, each additional disease was associated with a 54 [37-77]% increase in all-cause mortality. Mortality increased by 31 [21-41]% for each incremental point of Charlson's comorbidity score.
Conclusions:
A simple disease count is as predictive of mortality in T2D patients as the more complex Charlson's index. The possible usefulness of specific comorbidity indices in predicting incident disability in diabetic subjects needs to be further investigated.
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