Table 1.

Main demographic characteristics of the participants.

	Cases n = 76	Controls n = 73	p Value
Age (mean years)	49.78 (20–80)	48.71 (23–66)	ns
Gender (n, % women)	63 (82.89)	60 (82.19)	ns
Sudden onset (n, %)	58 (76.3)
Infection as trigger (n, %)	24/58 (41.37)
Mean years of symptoms (from sudden onset)	17.44 (5–63)
Short form 36 (0–100) (normal >50)	32.83 (6–64)
Mean degree of fatigue (1–4)	2.28 (1.80–2.70)
% fatigue vs pain (mean)	76 (60–98.75)