Besides, significant associations of plasma p-tau181 with CSF Aβ (β = −0.17, p = 0.037), CSF t-tau/Aβ (β = 0.25, p = 0.0009), and CSF p-tau/Aβ (β = 0.24, p = 0.001) were found in the CU– group, and significant associations of plasma p-tau181 with CSF t-tau (β = 0.22, p = 0.037) and CSF p-tau (β = 0.25, p = 0.016) were found in the dementia group. The gene discussed is MAPT; the disease is dementia.