Frequencies of cohort characteristics
| Variable | % (n) |
| Sex | |
| Boys | 48.4 (1939) |
| Girls | 51.6 (2071) |
| Ethnicity | |
| White UK | 74.2 (2312) |
| Non-white UK | 25.8 (806) |
| Looked After Status at preschool | |
| Not ‘Looked After’ | 98.2 (3936) |
| ‘Looked After’ | 1.8 (74) |
| Home multiple deprivation quintile (at preschool) | |
| 1—Most deprived | 28.4 (1104) |
| 2 | 22.5 (876) |
| 3 | 19.1 (743) |
| 4 | 16.7 (648) |
| 5—Least deprived | 13.3 (517) |
| Looked After Status at Primary 3 | |
| Not ‘Looked After’ | 97.2 (3898) |
| ‘Looked After’ | 2.8 (112) |
| Home multiple deprivation quintile (at Primary 3) | |
| 1—Most deprived | 27.5 (1103) |
| 2 | 23.8 (955) |
| 3 | 22 (882) |
| 4 | 16.7 (670) |