TABLE 1.

Demographic data and hemodynamic HUT results of the study population.

Demographic data
Number of patients	128
Females	116/128 (91%)
Height in cm	172 (8)
Weight in kg	75 (17)
Age in years	39 (11)
Median duration of ME/CFS (IQR) in years	9 (5–16)
Disease severity: mild/moderate/severe*	49/55/24 (38%/43%/19%)
Fibromyalgia present	65/128 (51%)
Self-reported cognitive problems	108/128 (84%)
SSRI use	34/128 (27%)
Hemodynamic responses during HUT
Normal heart rate/blood pressure response	59/128 (46%)
Postural orthostatic tachycardia syndrome (POTS)	49/128 (38%)
Orthostatic hypotension (OH)	20/128 (16%)

Data represent mean (SD). HUT: head-up tilt test; SSRI: selective serotonin reuptake inhibitors. *Disease severity grading according to classification of ICC (Carruthers et al., 2011).