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[A comparative study on comorbidity measurements with Lookback period using health insurance database: focused on
1Review & Assessment Policy Institute, Health Insurance Review & Assessment Service, Korea.
Insights
For patients undergoing percutaneous coronary intervention, the Charlson comorbidity index effectively predicts in-hospital mortality. A one-year lookback period is sufficient for assessing comorbidity in these patients.
Area of Science:
- Cardiology
- Health Outcomes Research
- Medical Informatics
Background:
- Accurate comorbidity assessment is crucial for predicting patient outcomes after percutaneous coronary intervention (PCI).
- Various comorbidity indices exist, but their performance and optimal lookback periods for predicting in-hospital mortality in PCI patients are not fully established.
- National health insurance databases offer large datasets for such retrospective analyses.
Purpose of the Study:
- To compare the predictive performance of three comorbidity indices: Charlson Comorbidity Index (CCI), Elixhauser Comorbidity Measures (ECM), and a selected comorbidity measure (SCM).
- To evaluate the impact of different comorbidity lookback periods (e.g., 1 year vs. 3 years) on the prediction of in-hospital mortality in patients undergoing PCI.
- To determine the most effective comorbidity measurement strategy for this patient population.
Main Methods:
- Retrospective analysis of patients aged 40 and older who underwent PCI, using data from the National Health Insurance Database.
- Diagnosis records were carefully selected to distinguish comorbidities from complications, excluding diagnoses related to the current hospital admission.
- Predictive performance was assessed using C-statistic values, with bootstrapping (1,000 replications) to determine 95% confidence intervals for comparing comorbidity measures and lookback periods.
Main Results:
- The study included 61,815 patients (mean age 63.3 years, 64.8% male), with an in-hospital mortality rate of 2.6% (1,598 deaths).
- While Elixhauser's comorbidity and comorbidity selection showed slightly better predictive ability than the Charlson Comorbidity Index, no statistically significant differences were found among the three measures.
- Increasing the lookback period to 3 years did not significantly improve the prediction of in-hospital mortality compared to a 1-year lookback period, despite a higher prevalence of recorded comorbidities.
Conclusions:
- The Charlson Comorbidity Index is a practical and sufficiently accurate tool for predicting in-hospital mortality in PCI patients within the National Health Insurance Database.
- A one-year observation period is adequate for adjusting comorbidity when evaluating health outcomes in this cohort.
- Further research is recommended to identify optimal comorbidity measurements and lookback periods for other diseases and procedures.
Objectives:
To compare the performance of three comorbidity measurements (Charlson comorbidity index, Elixhauser's comorbidity and comorbidity selection) with the effect of different comorbidity lookback periods when predicting in-hospital mortality for patients who underwent percutaneous coronary intervention.
Methods:
This was a retrospective study on patients aged 40 years and older who underwent percutaneous coronary intervention. To distinguish comorbidity from complications, the records of diagnosis were drawn from the National Health Insurance Database excluding diagnosis that admitted to the hospital. C-statistic values were used as measures for in comparing the predictability of comorbidity measures with lookback period, and a bootstrapping procedure with 1,000 replications was done to determine approximate 95% confidence interval.
Results:
Of the 61,815 patients included in this study, the mean age was 63.3 years (standard deviation: +/-10.2) and 64.8% of the population was male. Among them, 1,598 (2.6%) had died in hospital. While the predictive ability of the Elixhauser s comorbidity and comorbidity selection was better than that of the Charlson comorbidity index, there was no significant difference among the three comorbidity measurements. Although the prevalence of comorbidity increased in 3 years of lookback periods, there was no significant improvement compared to 1 year of a lookback period.
Conclusions:
In a health outcome study for patients who underwent percutaneous coronary intervention using National Health Insurance Database, the Charlson comorbidity index was easy to apply without significant difference in predictability compared to the other methods. The one year of observation period was adequate to adjust the comorbidity. Further work to select adequate comorbidity measurements and lookback periods on other diseases and procedures are needed.
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