Table 4 Comparison of CFS Cases identified with Two Methods of Applying the 1994 Case Definition

MFI-20

  General Fatigue ^{b, c}

17.05 (0.35)

14.20 (0.89)

16.59 (0.46)

  Reduced Activity ^a

12.95 (0.66)

10.27 (1.02)

10.56 (0.66)

 Physical Fatigue ^{a, b}

14.89 (0.41)

11.67 (1.04)

12.19 (0.70)

 Mental Fatigue

13.36 (0.67)

12.47 (1.18)

11.33 (0.69)

 Reduced Motivation

12.84 (0.56)

10.47 (0.94)

11.56 (0.65)

SF-36

  Physical Functioning ^c

58.64 (3.47)

78.67 (4.77)

64.81 (5.14)

  Role Physical ^c

31.25 (5.92)

71.67 (7.66)

42.59 (7.76)

  Social Functioning ^c

45.17 (3.28)

70.83 (5.41)

55.09 (3.96)

  Role Emotional

46.21 (6.52)

75.55 (8.89)

70.37 (7.82)

 Bodily Pain ^{a, b, c}

35.20 (2.38)

60.20 (4.58)

46.67 (3.37)

 General Health ^{a, b}

39.59 (2.63)

66.00 (4.58)

52.48 (3.52)

 Vitality ^b

20.80 (1.93)

36.33 (4.59)

27.41 (3.37)

 Mental Health ^b

55.55 (3.26)

75.73 (4.56)

65.19 (3.83)

CDC SI

  Number of CFS Symptoms ^{a, b}

5.55 (0.19)

4.6 (0.19)

4.74 (0.13)

  CFS Symptom Summary Score ^{a, b, c}

48.84 (2.22)

23.23 (2.02)

40.35 (1.94)

 PEM in CDC SI^d, n (%)

36 (81.82%)

11 (73.33%)

21 (77.78%)

Depression

 Zung SDS Score^b

46.48 (1.17)

37.20 (2.02)

42.00 (1.35)

 Depression (mod – severe), n (%)

1 (2.27%)

0

0