Prognostic impact of main frailty domain trajectories on 5-year mortality in very old adults: results from the PARTAGE cohort study.

We aimed to identify trajectories of nutrition, cognitive function, and autonomy over time among very old adults and to assess their impact onmortality. A cohort of subjects aged >= 80 years (in 2007-2008) who were followed for 5 years in 72 Italian and French nursing homes was used for post hoc analyses. Bodymass index (BMI; weight (kg)/height (m)(2)), MiniMental State Examination (MMSE) score, and Katz Index of Independence in Activities of Daily Living (ADL) score were assessed at 4 time points. Information on vital status was collected during follow-up. Latent trajectory and Cox models were used. In the 710 subjects included, the mean age at inclusion was 88.0 (standard deviation, 4.8) years, and 78.9% were female. We identified 7 composite trajectories based on BMI, MMSE, and ADL values. As compared with the reference group (trajectory 7-stable overweight; preserved cognitive function and autonomy), 2 trajectories presented increased hazards of dying: trajectory 1 (stable overweight; moderately impaired, then declining, cognitive function and autonomy (adjusted hazard ratio = 1.79, 95% confidence interval (CI): 1.26, 2.55)) and trajectory 6 (stable normal BMI; slight cognitive decline; and moderate, then degrading, loss of autonomy (adjusted hazard ratio = 1.67, 95% CI: 1.15, 2.44)). The C-index was 0.81 (95% CI: 0.72, 0.88). Repeatedmonitoring of BMI, MMSE score, and ADL in very old adults provides trajectories that produce better prognostic information than simple baseline assessment.