Eligible and assessed patients
| n | % | n | % | |
|---|---|---|---|---|
| Cohort 1992–94 | 764 | 100 | ||
| Died | 131 | 17.2 | ||
| Excluded because of participation in another study | 46 | 6.0 | ||
| Excluded because of severe handicap | 21 | 2.8 | ||
| Eligible | 566 | 74 | 566 | 100 |
| Not assessed | ||||
| Address unknown | 30 | 5.3 | ||
| Moved outside the country | 7 | 1.2 | ||
| Impossibility to make a convenient appointment | 52 | 9.2 | ||
| Refusal by the parents | 46 | 8.1 | ||
| Assessed | 431 | 76.2 |