Table 1.

Study population characteristics

		Controls	ME/CFS	Wilcoxon-test (p-value)	Controls	ME/CFS	Wilcoxon-test (p-value)
					(78 set)	(78 set)
n		49	49	NA	40	38	NA
Gender	Female	41	40	NA	32	29	NA
	Male	8	9		8	9
Age	All	51.09 ± 11.46	50.89 ± 11.40	p = 0.95	51.16 ± 11.90	51.84 ± 10.92	p = 0.79
	Female	50.94 ± 11.39	49.40 ± 11.95	p = 0.59	50.98 ± 11.93	50.08 ± 11.72	p = 0.85
	Male	51.85 ± 12.58	57.52 ± 4.82	p = 0.61	51.85 ± 12.58	57.52 ± 4.82	p = 0.61
BMI	All	25.44 ± 4.39	26.63 ± 4.87	p = 0.23	25.56 ± 4.53	27.22 ± 4.70	p = 0.08
	Female	25.35 ± 4.62	26.47 ± 5.23	p = 0.38	25.47 ± 4.86	27.17 ± 5.18	p = 0.15
	Male	25.92 ± 3.11	27.34 ± 2.86	p = 0.17	25.92 ± 3.11	27.34 ± 2.86	p = 0.17
Type of onset	Acute	NA	79.59%	NA	NA	78.95%	NA
	Gradual	NA	20.41%	NA	NA	21.05%	NA
Disease duration	< 3 years	NA	4	NA	NA	2	NA
	> 3 years	NA	45	NA	NA	36	NA
Season	Fall	48.98%	44.90%	NA	47.50%	42.11%	NA
	Summer	51.02%	55.10%	NA	52.50%	57.89%	NA
Site	Miami, FL	18.37%	20.41%	NA	17.50%	15.79%	NA
	Salt Lake City, UT	30.61%	28.57%	NA	30.00%	28.95%	NA
	Incline Village, NV	22.45%	22.45%	NA	22.50%	23.68%	NA
	New York, NY	28.57%	28.57%	NA	30.00%	31.58%	NA
MFI-20	General fatigue	7.61 ± 2.78	17.28 ± 3.70	p < 0.001	7.80 ± 2.80	17.42 ± 3.46	p < 0.001
	Physical fatigue	6.71 ± 2.45	16.57 ± 3.54	p < 0.001	6.70 ± 2.38	16.82 ± 3.50	p < 0.001
	Reduced activity	6.29 ± 2.47	15.47 ± 4.08	p < 0.001	6.25 ± 2.52	15.76 ± 3.93	p < 0.001
	Reduced motivation	6.88 ± 2.45	12.45 ± 4.17	p < 0.001	6.95 ± 2.47	12.50 ± 4.39	p < 0.001
	Mental fatigue	7.55 ± 3.29	14.8 ± 4.21	p < 0.001	7.45 ± 3.40	15.03 ± 4.28	p < 0.001
SF-36	Physical component score	55.49 ± 3.64	27.91 ± 9.68	p < 0.001	55.16 ± 3.57	27.67 ± 9.85	p < 0.001
	Mental component score	54.02 ± 7.30	40.18 ± 10.74	p < 0.001	54.13 ± 5.23	40.83 ± 10.72	p < 0.001