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Related Experiment Videos

Predicting 12-month mortality for persons with dementia.

Robert Newcomer1, Kenneth E Covinsky, Ted Clay

  • 1Departments of Social & Behavioral Science, University of California, San Francisco, CA 94118, USA. rjn@itsa.ucsf.edu

The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
|May 6, 2003
PubMed
Summary

A new model predicts 12-month mortality in individuals with organic dementia using factors like age, ADL difficulty, and caregiver type. This tool aids in understanding mortality risk for dementia patients.

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Area of Science:

  • Gerontology
  • Neurology
  • Biostatistics

Background:

  • Organic dementia poses a significant mortality risk.
  • Accurate prediction of mortality is crucial for patient care and resource allocation.
  • Existing models may not fully capture the complexity of mortality predictors in dementia.

Purpose of the Study:

  • To develop and validate a predictive model for 12-month mortality in individuals with organic dementia.
  • To identify key demographic, clinical, and caregiving factors associated with mortality risk.
  • To assess the predictive performance and efficiency of the developed model.

Main Methods:

  • Utilized data from caregiver interviews and Medicare claims for 3858 individuals with organic dementia.
  • Employed proportional hazards models to predict time to death, using two distinct start dates.

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  • Included variables such as age, gender, activities of daily living (ADL) difficulty, medical conditions, prior hospitalizations, and primary caregiver type.

    • Main Results:

    • The final mortality prediction model incorporated age, gender, ADL difficulty, medical conditions, prior hospitalizations, and daughter as caregiver.
    • Hazard ratios were combined to create a cumulative mortality risk score.
    • Model discrimination was reasonable, with c-statistics of 0.72 and 0.69, and non-significant calibration tests.

    Conclusions:

    • The developed model demonstrates reasonable predictive accuracy for 12-month mortality in organic dementia.
    • The ratio of false to true positives varied with sensitivity, being lower when including two or more ADL difficulties.
    • Validation testing confirmed comparable sensitivity and specificity to the reference model, supporting its clinical utility.