Proportion of children who were included or missing at sweep 7 by demographic characteristics
| Missing from sample (%) | Included in sample (%) | |
| Family type | ||
| Lone parent | 29.7 | 13.2 |
| Living with partner | 70.3 | 86.8 |
| Age of mother at birth of cohort child | ||
| Under 20 | 12.6 | 3.8 |
| 20–29 | 49.5 | 35.6 |
| 30–39 | 35.3 | 56.6 |
| 40 or older | 2.6 | 4.0 |
| Income quintile | ||
| Bottom quintile | 31.0 | 14.5 |
| 2 | 22.7 | 19.3 |
| 3 | 16.0 | 19.5 |
| 4 | 16.2 | 24.4 |
| Top quintile | 14.1 | 22.3 |
| Scottish Index of Multiple Deprivation Quintiles | ||
| 5—Most deprived | 32.1 | 17.5 |
| 4 | 19.4 | 17.1 |
| 3 | 16.7 | 21.7 |
| 2 | 17.7 | 21.6 |
| 1—Least deprived | 14.2 | 22.1 |
| Education level of mother | ||
| No qualifications | 14.7 | 6.2 |
| Standard Grades or above | 26.1 | 15.1 |
| Highers or above | 59.2 | 78.7 |
| Child ethnic group | ||
| White | 93.5 | 96.5 |
| Non-white | 6.5 | 3.5 |
| Child sex | ||
| Male | 53.1 | 50.6 |
| Female | 46.9 | 49.4 |
| Urban/rural indicator | ||
| Large urban | 40.1 | 36.7 |
| Other urban | 34.6 | 29.4 |
| Small accessible towns | 9.2 | 9.8 |
| Small remote towns | 2.5 | 3.2 |
| Accessible rural | 10.5 | 15.4 |
| Remote rural | 3.1 | 5.4 |
| Base | 1761 | 3456 |