http://www.ncbi.nlm.nih.gov/pubmed/25190680
Abstract
Early
detection of subjects at high risk of developing dementia is essential.
By dealing with censoring and competing risk of death, we developed a
score for predicting 10-year dementia risk by combining cognitive tests,
and we assessed whether inclusion of cognitive change over the previous
year increased its discrimination. Data came from the French
prospective cohort study Personnes Agées QUID (PAQUID) and included
3,777 subjects aged 65 years or older (1988-1998). The combined
prediction score was estimated by means of an illness-death model
handling interval censoring and competing risk of death. Its predictive
ability was measured using the receiver operating characteristic (ROC)
curve, with 2 different definitions depending on the way subjects who
died without a dementia diagnosis were considered. To account for
right-censoring and interval censoring, we estimated the ROC curves by
means of a weighting approach and a model-based imputation estimator.
The combined score exhibited an area under the ROC curve (AUROC) of 0.81
for discriminating future demented subjects from subjects alive and
nondemented 10 years later and an AUROC of 0.75 for discriminating
future demented subjects from all other subjects (including deceased
persons). Adjustment for cognitive change over the previous year did not
improve prediction.
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