Demographic and CFS disease characteristics for patients in the Rituximab and Placebo groups.

a: p-values from student's t-test for continuous data, and from Chi-square tests (or Fisher's exact test) for categorical characteristics.b: infectious mononucleosis or unspecific viral infection (6), gastroenteritis (4), respiratory infection (5), urinary infection (1).c: patient's assessment of CFS clinical course the last year before inclusion.d: thyroiditis (2), psoriasis (2), carpal tunnel syndrome (1), diabetes mellitus type I (1), celiac disease (1), juvenile arthritis (1).e: Bechterew's disease, rheumatoid arthritis, psoriasis, Cushing's disease, diabetes mellitus type I, systemic lupus erythematosus, thyroiditis, celiac disease, ulcerative colitis, Sjogren's disease, glomerulonephritis.