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Table 1 Characteristics of study participants

From: Submaximal exercise testing with near-infrared spectroscopy in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome patients compared to healthy controls: a case–control study

  ME/CFS cases (N = 16) Healthy controls (N = 16) P value* case vs. control*
Age (years) 55 (46.5;62.5) 54 (49.5;65) 0.76
BMI (kg/m2) 25.1 (21.7;31.5) 20.8 (19.2;23.9) 0.03
Skinfold thickness (mm)** 8 (7;10) 7 (5;10) 0.49
Ethnicity (Caucasian vs. other) 15 (94%) 13 (81%) 0.60
Fukuda definition 16 (100%) 0 (0%) <0.0005
Fatigue Severity Scale 61 (56.5;63) 17 (13.5;21.5) <0.0005
Orthostatic intolerance 1 (6.3%) 4 (25.0%) 0.3
Number of tender points 1 (0;6) 0 (0;0) 0.009
Hemoglobin (g/L) 134 (130;137) 131.5 (125.5;137.5) 0.47
Ferritin (μg/L) 43.5 (25;73.5) 43 (24;84) 1.00
Acyl carnitine (umol/L) 11.5 (8.3;15.0) 12.3 (8.9;14.0) 1.00
  1. Values are N (%) or median (inter-quartile range (IQR). BMI Body Mass Index.
  2. * P values are univariable exact test for discrete variables and rank sum for continuous variables. Significant P values are indicated in italics.
  3. ** Skinfold thickness measurement for 10 ME/CFS cases and 9 controls only.