Parental consent and participation rates
| Age group (years) | Number invited | Parental consent (% (median)) | IQR parental consent % individual schools | Participation (% (median)) | IQR participation % individual schools | Number of participants examined |
| 6–7 | 700 | 62 (62) | 58–72 | 57 (57) | 52–69 | 399 |
| 12–13 | 1115 | 65 (71) | 59–78 | 60 (67) | 53–77 | 669 |
IQR, interquartile range.