Background
Multidimensional Prognostic Index (MPI) is recognized as prognostic tool in hospitalized patients, but data on the value of MPI in community-dwelling older persons are limited. Using data from a representative cohort of community-dwelling persons, we tested the hypothesis that MPI explains mortality, over 15 years of follow-up.
Methods
A standardized comprehensive geriatric assessment was used to calculate the MPI and to categorize participants in low-, moderate-, and high-risk classes. The results were reported as hazard ratios (HRs) and the accuracy was evaluated with the AUC (area under the curve), with 95% confidence intervals (CIs) and the C-index. We also reported the median survival time by standard age groups.
Results
All 1,453 participants (mean age 68.9 years, women=55.8%) enrolled in the InCHIANTI study at baseline were included. Compared to low risk group, participants in moderate (HR=2.10; 95%CI: 1.73-2.55) and high MPI risk group (HR=4.94; 95%CI: 3.91-6.24) had significantly higher mortality risk. The C-index of the model containing age, sex, and MPI was 82.1, indicating a very good accuracy of this model in explaining mortality. Additionally, the time-dependent AUC indicated that the accuracy of the model incorporating MPI to age and sex was excellent (>85.0) during the whole follow-up period. Compared to participants in the low-risk MPI group across different age-groups, those in medium- and high-risk groups survived 2.9 to 7.0 years less and 4.3 to 8.9 years less, respectively.
Conclusions
In community-dwelling individuals, higher MPI values are associated with higher risk of all-cause mortality with a dose-response effect.