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| Characteristics | Number of patients (n = 450) | Percentage (%) |
| Sleep problems in infancy | ||
| Present | 32 | 7.1 |
| Absent | 418 | 92.9 |
| Family history of sleep disorders | ||
| Present | 17 | 3.8 |
| Absent | 433 | 96.2 |
| Family member suffering from sleep disorders (n = 17) | ||
| Father | 8 | 47.0 |
| Grandfather | 5 | 29.4 |
| Grandmother | 2 | 11.8 |
| Mother | 2 | 11.8 |
