Table 1.

Baseline characteristics of cases compared to controls

	Cases (N = 43)	Controls (N = 124)
Demographics
Age (years), mean (SD)	34.7 (18.5)	33.8 (16.1)
Female, n (%)	29 (67.4)	87 (67.4)
Chronic illnesses, n (%)	17 (39.5)	50 (38.8)
Frequency of attacks
Below six attacks, n (%)	23 (53.5)	–
Six attacks or more, n (%)	20 (46.5)	–
HUT results
Positive, n (%)	19 (44.2)	–
Negative, n (%)	8 (18.6)	–
Not performed, n (%)	16 (37.2)	–

Abbreviations: SD, standard deviation; HUT, Head-Up Table Tilt test.