Table 1.
Descriptive Statistics of Participants at Age 7 Years and Score on the British Ability Scales Verbal Similarities Scale at Age 11 Years, Millennium Cohort Study, 2001–2013
| Characteristic | No. | % | Mean (SD) |
|---|---|---|---|
| Total sample | 8,462 | ||
| Male sex | 4,228 | 50.0 | |
| White British race/ethnicity | 7,468 | 88.3 | |
| Maternal age, years | 36.6 (5.8) | ||
| Maternal academic qualification level ≥4a | 3,547 | 41.9 | |
| Poverty-level income | 2,013 | 23.8 | |
| Smoked during pregnancy | 2,649 | 31.3 | |
| Strengths and Difficulties Questionnaire score | 7.3 (5.0) | ||
| BAS Verbal Similarities scale score | 59.5 (9.5) | ||
| Accelerometry sample | 4,724 | ||
| Sedentary time, minutes/day | 392.7 (65.9) | ||
| Light activity, minutes/day | 279.9 (40.6) | ||
| MVPA, minutes/day | 62.1 (22.1) | ||
| Accelerometer wear time, minutes/day | 734.6 (59.7) |
Abbreviations: BAS, British Ability Scale; MVPA, moderate-to-vigorous physical activity; SD, standard deviation.
a National Vocational Qualification score.