NPPB and Alzheimer disease: Similar to the analysis performed by Hu and colleagues [28], who grouped subjects diagnosed with MCI and AD together (N = 508), and compared this group with healthy controls (N = 58), in our study, we also grouped together subjects with MCI and AD patients (N = 443), and compared their levels of BNP to the BNP levels detected in cognitively healthy individuals (N = 191).