Fatigue as measured by the MFI was similar between AAV-CFS patients (score = 70) and FM patients (score = 75) (p = 0.17), as were BMI (27.2 vs 25.1) (p = 0.10), and CRP levels (4.1 vs 2.6) (p = 0.20) (Table 4). Here, CRP is linked to myalgic encephalomeyelitis/chronic fatigue syndrome.