Table 2

Baseline characteristics of participants

VariablesIntervention (n=27)Usual (n=31)
Sex: female11 (41)17 (55)
Mean age (±SD)16.6±1.016.4±1.0
Primary cardiac diagnosis
 Coarctation of the aorta6 (22)5 (16)
 d-Transposition of the great arteries5 (19)4 (13)
 Tetralogy of Fallot4 (15)4 (13)
 Double outlet RV03 (10)
 Moderate or severe aortic valve stenosis3 (11)4 (13)
 Other congenital heart disease6 (22)8 (26)
 Dilated cardiomyopathy2 (7)1 (3)
 Hypertrophic cardiomyopathy1 (4)2 (6)
Previous cardiac surgery19 (70)21 (68)
Pacemaker or defibrillator2 (7)1 (3)
Previous cardiac catheterisation19 (70)24 (77)
On medication at enrolment10 (37)15 (48)
  • Results are presented as N (%) unless otherwise indicated.