Description of the sample at a person-year level before and after weighting, overall and stratified into those measured before and those measured during the COVID-19 pandemic
| Characteristic | 2011–2012 weighted sample % | Before the COVID-19 pandemic* | During the COVID-19 pandemic† | Total | |||
| Unweighted person-years (%) | Weighted person-years % | Unweighted person-years (%) | Weighted person-years % | Unweighted person-years (%) | Weighted person-years % | ||
| Sex | |||||||
| Male | 52.9 | 6101 (51.4) | 50.9 | 2331 (52.5) | 49.6 | 8432 (51.7) | 50.5 |
| Female | 47.1 | 5766 (48.6) | 49.1 | 2113 (47.6) | 50.4 | 7879 (48.3) | 49.5 |
| Ethnicity | |||||||
| White | 83.5 | 8336 (71.4) | 82.5 | 3306 (74.0) | 82.6 | 11 642 (72.1) | 82.6 |
| Asian | 6.2 | 1567 (13.4) | 6.3 | 418 (9.4) | 4.5 | 1985 (12.3) | 5.7 |
| Black | 3.5 | 553 (4.7) | 2.9 | 98 (2.2) | 1.2 | 651 (4.0) | 2.3 |
| Mixed | 6.0 | 1137 (9.7) | 7.7 | 620 (13.9) | 11.3 | 1757 (10.9) | 8.8 |
| Other | 0.8 | 84 (0.7) | 0.6 | 28 (0.6) | 0.5 | 112 (0.7) | 0.6 |
| Lone parent | 23.8 | 2306 (19.6) | 22.1 | 527 (11.7) | 17.8 | 2833 (17.4) | 20.7 |
| Highest parent education | |||||||
| Degree | 48.0 | 5773 (52.1) | 51.7 | 2601 (61.1) | 53.5 | 8374 (54.6) | 52.3 |
| Upper secondary education (A-level) | 9.0 | 1067 (9.6) | 9.3 | 443 (10.4) | 9.6 | 1510 (9.9) | 9.4 |
| Lower secondary education (GCSE) | 30.5 | 2743 (24.8) | 27.7 | 730 (17.2) | 27.6 | 3473 (22.7) | 27.7 |
| None | 12.5 | 1493 (13.5) | 11.3 | 481 (11.3) | 9.4 | 1974 (12.9) | 10.7 |
| No parent employed | 19.2 | 1819 (16.2) | 15.9 | 491 (10.9) | 14.9 | 2310 (14.7) | 15.6 |
| Low-income household | 15.3 | 1695 (16.7) | 15.9 | 850 (18.9) | 21.7 | 2545 (17.4) | 17.8 |
| Resident in high deprivation area | 22.1 | 2884 (24.4) | 22.0 | 669 (15.0) | 16.5 | 3553 (21.8) | 20.2 |
| Mean age (SD) | 6.4 (1.4) | 6.5 (1.5) | 6.5 (1.4) | 8.2 (1.9) | 8.2 (1.7) | 7.0 (1.8) | 7.0 (1.7) |
| Mean SDQ score (SD) | 8.6 (5.7) | 8.5 (5.9) | 8.7 (5.9) | 8.8 (6.2) | 9.6 (6.6) | 8.6 (6.0) | 9.0 (6.2) |
| Total N | 1751 | 11 868 | 10 680‡ | 4493 | 4073‡ | 16 361 | 15 114‡ |
*Understanding Society surveys between 2011 and 2019.
†Understanding Society COVID-19 surveys in July 2020, September 2020, March 2021.
‡Person-years contributing to the weighted proportions.
GCSE, General Certificate of Secondary Education; SD, Standard deviation; SDQ, Strengths and Difficulties Questionnaire.