Table 2.
Baseline characteristics
| Study participants N = 126 | Non-participants N = 99 | Not invited N = 51 | |
|---|---|---|---|
| Child- and treatment-related factors | |||
| Child age at diagnosis—Median [IQR] | 5.1 [3.1; 9.3] | 5.5 [3.5; 11.9] | 5.8 [3.8; 11.5] |
| Female child sex—N (%) | 51 (40.5) | 42 (42.1) | 23 (45.1) |
| Time since diagnosis in months—Median [IQR] | 4.5 [4.1; 5.1] | ||
| Preexisting sleep problems—N (%) | 19 (15.1) | ||
| Use of sleep medication—N (%) | 8 (6.3) | ||
| Comorbid chronic illness—N (%)a | 8 (6.3) | ||
| Sharing a bedroom—N (%) | 26 (20.6) | ||
| Parental- and family factors | |||
| Parental age | 37.0 [34.0; 43.0] | ||
| Female parental sex—N (%) | 98 (77.8) | ||
| Educational level—N (%) | |||
| Low | 5 (4.0) | ||
| Middle | 36 (28.6) | ||
| High | 82 (65.1) | ||
| Unknown | 3 (2.4) | ||
| Country of birth—N (%) | |||
| Netherlands | 116 (92.1) | ||
| Otherb | 7 (5.6) | ||
| Unknown | 3 (2.4) |
aDown syndrome (n = 3), autism (n = 1), hypermobility (n = 1), coeliac disease (n = 1), anorectal malformation (n = 1), and cavernomas in the brain (n = 1).
bBrazil (n = 1), Kenya (n = 1), Romania (n = 1), South Africa (n = 1), Surinam (n = 2), and Turkey (n = 1).