Routine Blood Indicators Combined With Sleep Questionnaires for the Identification of Cognitive Impairment in Parkinson's Disease: A Cross‐Sectional Study With a Leakage‐Free Nested Modeling Framework
Cognitive impairment (CI) is a prevalent non‐motor complication of Parkinson's disease (PD), yet accessible and reliable screening aids remain limited. This cross‐sectional study aimed to quantify the strength of association and the cross‐sectional classification value of routine blood indicators combined with standard...