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Box plot showing 10th, 25th, 50th, 75th, and 90th centiles of cerebrospinal fluid concentration of nitric oxide oxidation products nitrite and nitrate in six healthy controls and 21 patients with mild (1), moderate (2), or severe (3) neuropsychiatric lupus. p<0.004 for each patient group compared with healthy controls. The group with mild disease differed significantly from the group with severe disease (p<0.04).
