Basic information on school population
| School 1 | School 2 | Total | |
|---|---|---|---|
| Written consent was obtained for the participation of 87.5% of the children attending both schools. There was no reply obtained after two requests from seven of the parents or guardians. Of the 11 children for whom consent was refused, seven were already known to the clinical genetics services and had definitive diagnoses. | |||
| Number attending | 55 | 73 | 128 |
| No reply | 4 | 3 | 7 |
| Consent refused | 5 | 6 | 11 |
| Number examined | 46 (83.6%) | 64 (87.7%) | 110 |
| Male:female ratio | 30:16 | 37:27 | 67:43 |
| Age range (years) | 5.8–13.1 | 11.9–17.9 | 5.8–17.9 |
| Mean age (years) | 9.75 | 14.0 | 12.3 |