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Table 5 Distribution of cases identified by the CDC research criteria for unexplained fatigue (CFS and unwell/not fatigued) and well controls across the empirically derived five classes: N (%)

From: Replication of an empirical approach to delineate the heterogeneity of chronic unexplained fatigue

  Class 1
(n = 97)
Class 2
(n = 92)
Class 3
(n = 77)
Class 4
(n = 76)
Class 5
(n = 44)
CFS (n = 92) 41 (44) 47(51) 3(3) 1(1) 0
unwell not fatigued (n = 201) 53 (26) 43(21) 56(28) 32(16) 17(8)
well (n = 93) 3 (3) 2(2) 18 (19) 43 (46) 27 (29)