CAT and amyotrophic lateral sclerosis: There was no difference in significance or magnitude of these associations after correcting for possible outliers (OR = 1.054, p = 0.098 for CAT on AD; OR = 1.020, p = 0.396 for GPX on AD; OR = 1.000, p = 0.952 for UA on AD; OR = 0.999, p = 0.064 for UA on ALS; and OR = 1.001,p = 0.819 for albumin on ALS; and OR = 1.000, p = 0.638 for UA on PD).