Mortality prediction among older people in primary care: a comparison of predictive performance of the frailty index with regression-based and machine learning models

Regression-based and machine learning prediction models using single frailty deficits outperform the frailty index in predicting one- and five-year mortality. However, these models can be more complex and less interpretable. We found lower performance for people with dementia, suggesting the models are less applicable in this subpopulation.