Sociodemographic characteristics of the weighted sample: UK Millennium Cohort Accelerometer Study, fourth follow-up (2008–2009)
| (N=5172) | Level | n (%) |
| Gender | Female | 2592 (50.1) |
| Male | 2580 (49.8) | |
| Country | England | 3390 (65.5) |
| Wales | 676 (13.1) | |
| Scotland | 612 (11.8) | |
| Northern Ireland | 494 (9.6) | |
| Weight status | Not overweight | 4296 (83.3) |
| Overweight | 663 (12.9) | |
| Obese | 196 (3.8) | |
| Ethnic group | White | 4543 (87.8) |
| Mixed | 130 (2.5) | |
| Indian | 115 (2.2) | |
| Pakistani or Bangladeshi | 194 (3.8) | |
| Black or Black British | 127 (2.5) | |
| Other ethnic group | 63 (1.2) | |
| Maternal education | No qualifications | 263 (5.1) |
| Low | 1241 (24.0) | |
| Medium | 787 (15.2) | |
| High | 1965 (38.0) | |
| Higher | 447 (8.6) | |
| Overseas qual. | 108 (2.1) | |
| None of these | 361 (7.0) | |
| Equivalised monthly household income (£), mean (SD) | 1700.9 (943.1) | |
| Distribution of valid days | 6.1 (1.2) | |
| Age (years) | 6.8 (0.39) | |