Table 1.

Demographic characteristics of the sample

	Children diagnosed with an inherited cardiac arrhythmia syndrome (n=47)	Children being screened due to a family history of an inherited cardiac arrhythmia syndrome (n=78)	Control children (n=75)
Age of child, years
Mean (SD)	13.18 (2.34)	12.90 (2.58)	12.08 (2.39)
Minimum/maximum	8.40/16.49	8.05/16.91	8.24/15.99
Gender, n (%)
Male	21 (45)	37 (48)	27 (36)
Female	26 (55)	41 (52)	48 (64)
Ethnicity, n (%)
White	30 (64)	53 (68)	63 (84)
Black or black British	5 (11)	10 (13)	4 (5)
Mixed	4 (9)	8 (10)	5 (7)
Asian or Asian British	6 (13)	6 (8)	0 (0)
Chinese	0 (0)	0 (0)	0 (0)
Other	0 (0)	0 (0)	2 (3)
Missing	2 (4)	1 (1)	1 (1)
Family structure, n (%)
Nuclear family	29 (62)	49 (62)	63 (84)
Single parent	14 (30)	17 (22)	7 (9)
Step family	3 (6)	7 (9)	4 (5)
Extended family	1 (2)	3 (4)	0 (0)
Children in care	0 (0)	2 (3)	0 (0)
Missing	0 (0)	0 (0)	1 (1)
Socioeconomic status, n (%)
Higher managerial, administrative and professional occupations	14 (30)	25 (32)	7 (9)
Lower managerial, administrative and professional occupations	5 (11)	20 (26)	36 (48)
Intermediate occupations	2 (4)	3 (4)	5 (7)
Small employers and own account workers	0 (0)	1 (1)	4 (5)
Lower supervisory, craft and related occupations	9 (19)	13 (17)	7 (9)
Semi routine occupations	10 (21)	8 (10)	5 (7)
Routine occupations	3 (6)	3 (4)	3 (4)
Unemployed	4 (9)	1 (1)	0 (0)
Missing	0 (0)	4 (5)	8 (11)