Development and Validation of a Predictive Model for Mild Cognitive Impairment in Older Adults with Multimorbidity.

Mild cognitive impairment prevalence was 26.81%.

Protective factors: higher education (OR=0.23), more frequent physical exercise (OR=0.15), and more frequent social activities (OR=0.26) (all P<0.05).

The AUC was 0.862 (training) and 0.832 (external validation).

Calibration curves showed good agreement, and decision curve analysis indicated net clinical benefit across threshold probabilities of (10-65%).