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Table 1 Demographic and clinical characteristics overall and by fatigue group

From: Sleep assessment in a population-based study of chronic fatigue syndrome

  Overall NF NF | F ISF M/P CFS-R CFS
No. (%) 339 41 (12.1) 21 (6.2) 90 (26.6) 145 (42.8) 18 (5.3) 24 (7.1)
Mean Age, years (SD) 45.8 (10.9) 46.9(13.0) 40.6(8.2) 44.5(11.2) 47.3(10.5) 46.4(7.5) 44.7(10.4)
Female (%) 77.0 63.4 71.4 74.4 83.5 72.2 79.2
White (%) 94.1 92.7 100.0 91.1 96.6 83.3 95.8
Education > High School(%) 65.5 80.5 66.7 62.2 63.5 55.6 70.8
Income > $40,000/yr (%) 47.5 58.5 61.9 44.4 43.5 66.7 37.5
Mean BMI (SD)* 28.5 (6.3) 25.3(4.7) 28(5.7) 28.6(6.4) 29.5(6.7) 28.6(5.2) 28.2(6.0)
<18.5: Underweight (%) 3.6 7.3 4.8 2.2 2.8 0.0 8.3
18.5–24.9: Normal (%) 25.7 36.6 23.8 27.8 23.6 22.2 16.7
25–29.9: Overweight (%) 30.5 41.5 33.3 26.7 27.8 38.9 33.3
30–39.9: Obesity (%) 32.8 14.6 33.3 33.3 36.1 33.3 41.7
≥ 40: Extreme obesity (%) 7.4 0.0 4.8 10.0 9.7 5.6 0.0
Neck circumference (cm) Mean (SD) 36.4 (3.8) 35.7 (3.9) 36.4 (3.7) 36.8 (4.1) 36.4 (3.8) 36.3 (2.6) 36.3 (3.3)
≥ 43.18 cm in males (%) 12.8 0.0 16.7 17.4 20.8 0.0 0.0
≥ 40.64 cm in females (%) 6.3 7.7 0.0 12.1 4.2 7.7 0.0
Years fatigued, median (Range) 6.8 (0.3–55.5) -------- -------- 5.9 (0.5–40.8) 7.2 (0.3–55.5) 8.6 (2.1–39.7) 6.5 (1.4–47.8)
Mean Wellness score (SD) 53.0 (22.7) 85.5(14.9) 70.5(17.2) 51.9 (17.0) 44.0 19.3) 56.4 19.2) 39.8 (18.3)
Fatigue severity score Mean (SD) 5.4 (1.0) ------- ------ 5.0 (0.9) 5.5 (1.0) 5.6 (0.8) 6.0 (0.6)
  1. *P = 0.0157; P < 0.0001 NF – never fatigued; NF|F – baseline fatigue currently not fatigued; ISF – insufficient symptoms or fatigue for CFS; M/P – medical or psychiatric exclusion; CFS-R – baseline CFS currently remission; CFS – currently CFS