SOD1 and Alzheimer disease: The enzymatic activities of SOD (RE: SMD = −2.21, I2 = 97%, 95%CI = [−3.59, −0.82], Z = 3.13, p = 0.002; Figure 2A) and GPx (RE: SMD = −0.89, I2 = 91%, 95%CI = [−1.64, −0.15], Z = 2.36, p = 0.02; Figure 2B) in erythrocytes of AD patients were significantly decreased.