GAPDH and Alzheimer disease: The blood S-glutathionylated GAPDH data from the 191 controls, including those within the age ranges of 20–29, 30–39, 40–49, 50–59, 60–69, 70–79, and 80–89 years, were compared with those of the 47 patients with AD, including patients in the age ranges of 40–69, 70–79, and 80–89 years.