Table 1.

The mean value ± SD for the clinical variables recorded here for the chronic fatigue syndrome (CFS) and normal control (NC) groups and the p-value for a null difference between them

	Clinical score	CFS	NC	p		Clinical score	CFS	NC	p
	Age	31.7 ± 8.8	33.7 ± 10.3	NS	2	HR (seated)	76.6 ± 7.1	71.2 ± 10.2	0.037
	Weight, kg	67.6 ± 10.9	68.9 ± 14.0	NS	2	HR (asleep)	67.0 ± 9.2	61.5 ± 9.5	0.046
					2	PP (seated)	46.9 ± 6.8	51.2 ± 7.2	0.040
1	Fatigue duration	7.4 ± 3.5			2	PP (asleep)	47.5 ± 7.3	49.0 ± 7.9	NS
1	Bell score	41.6 ± 11.4	99.6 ± 2.1	< 0.0001	2	Systolic BP (seated)	120.4 ± 8.9	123.9 ± 9.7	NS
1,2	Total SS	45.9 ± 11.6	93.6 ± 5.6	< 0.0001	2	Systolic BP (asleep)	105.3 ± 12.3	108.5 ± 11.4	NS
	HADS depression	8.4 ± 4.7	4.0 ± 3.3	< 0.0002	2	Diastolic BP (seated)	73.5 ± 6.6	72.7 ± 7.9	NS
	HADS anxiety	6.6 ± 3.0	1.7 ± 2.3	< 0.0001	2	Diastolic BP (asleep)	57.8 ± 7.9	59.5 ± 7.8	NS

NS is p > 0.05. SS, symptom score; HR, heart rate; PP, pulse pressure; BP, blood pressure in mm Hg; HADS, hospital anxiety and depression scale. The leading number for each item indicates it was used in one-sample regressions (1), two-sample regressions (2) or both (1,2) with MR images.