Table 1.

Clinical characteristics of populations.

	Early-Onset AF Cohort (n = 527)	Control Cohort (n = 383)
Sex, male, n (%)	441 (83.6)	257 (67)
Age, years, median (IQR)	30 (24–36) a	71 (66–76) b
Height, cm, mean (SD)	183 (±9)	172 (±9)
Weight, kg, mean (SD)	89 (±17)	77 (±15)
BMI, kg/m2, mean (SD)	26 (±5)	26 (±5)
Comorbidities:
Hypertension, n (%)	0 (0)	246 (64.2)
Diabetes, n (%)	0 (0)	39 (10.2)
Heart failure, n (%)	0 (0)	0 (0)
Ischemic heart disease, n (%)	0 (0)	0 (0)
Valvular heart disease, n (%)	0 (0)	0 (0)

AF, atrial fibrillation; BMI, body mass index; IQR, interquartile range; SD, standard deviation. ^a Age of AF onset; ^b age at enrolment in cohort.