1. Christakis NA. Death Foretold: Prophecy and Prognosis in Medical Care. Chicago, Ill: University of Chicago Press; 1999.
2. Iezzoni LI. Risk Adjustment for Measuring Healthcare Outcomes. 2nd ed. Chicago, Ill: Health Administration Press; 1997.
3. Guralnik JM, Ferrucci L. Demography and epidemiology. In: Hazzard WR, Blass JP, Halter JB, Ouslander JG, Tinetti ME, eds. Principles of Geriatric Medicine and Gerontology. 5th ed. New York, NY: McGraw-Hill; 2003:53–75.
4. Walter LC, Brand RJ, Counsell SR, et al. Development and validation of a prognostic index for 1-year mortality in older adults after hospitalization. JAMA. 2001;285:2987–94.
5. Inouye SK, Peduzzi PN, Robison JT, Hughes JS, Horwitz RI, Concato J. Importance of functional measures in predicting mortality among older hospitalized patients. JAMA. 1998;279:1187–93.