Table 1.

Demographics of study subjects

	Patients with LQTS (n = 23)	PAQ controls (n = 23)	Exercise test controls (n = 23)
Mean age ± SEM	14.7 ± 0.5	14.5 ± 0.4	14.5 ± 0.5
11-12 (y) (n)	6	6	5
13-14 (y) (n)	9	8	9
15-16 (y) (n)	4	7	5
17-20 (y) (n)	4	2	4
n, % Male	10, 43	10, 43	10, 43
n, % on beta-blocker medication	21, 91	–	–

LQTS, long QT syndrome; n, number of participants; PAQ, Physical Activity Questionnaire; SEM, standard error of the mean.