CD34 and Alzheimer disease: Thus, plasma levels of leptin andCD34+ cells have been independently associated with AD comparedto controls (leptin: P = 0.002; CD34+ cells:P = 0.022), whereas adiponectin plasma levels neither have beenassociated with AD (P = 0.470) nor have been influenced by anyother potential confounders (all,P>0.05) (Table 3).