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/maximum8.40/16.498.05/16.918.24/15.99
Gender, n (%)
 Male21 (45)37 (48)27 (36)
 Female26 (55)41 (52)48 (64)
Ethnicity, n (%)
 White30 (64)53 (68)63 (84)
 Black or black British5 (11)10 (13)4 (5)
 Mixed4 (9)8 (10)5 (7)
 Asian or Asian British6 (13)6 (8)0 (0)
 Chinese0 (0)0 (0)0 (0)
 Other0 (0)0 (0)2 (3)
 Missing2 (4)1 (1)1 (1)
Family structure, n (%)
 Nuclear family29 (62)49 (62)63 (84)
 Single parent14 (30)17 (22)7 (9)
 Step family3 (6)7 (9)4 (5)
 Extended family1 (2)3 (4)0 (0)
 Children in care0 (0)2 (3)0 (0)
 Missing0 (0)0 (0)1 (1)
Socioeconomic status, n (%)
 Higher managerial, administrative and professional occupations14 (30)25 (32)7 (9)
 Lower managerial, administrative and professional occupations5 (11)20 (26)36 (48)
 Intermediate occupations2 (4)3 (4)5 (7)
 Small employers and own account workers0 (0)1 (1)4 (5)
 Lower supervisory, craft and related occupations9 (19)13 (17)7 (9)
 Semi routine occupations10 (21)8 (10)5 (7)
 Routine occupations3 (6)3 (4)3 (4)
 Unemployed4 (9)1 (1)0 (0)
 Missing0 (0)4 (5)8 (11)