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C1q-antibodies levels in normal blood donors (Donors) (60 ± 30), in chronically hepatitis C virus-infected patients (HCV) (83 ± 40), in HCV-cryoglobulin positive patients (HCV Cryo+) (86 ± 44), in HCV-cryoglobulin negative patients (HCV Cryo–) (77 ± 49) and in systemic lupus erythematosus (SLE) patients (295 ± 71). *P < 0·01, **P < 0·001 compared to normal blood donors.
