Wave | Age* | Years conducted | Productive sample | Household response by wave (%) | Participated in all previous waves | |
Children | Families | |||||
1 | 9 months | 2001–2002 | 19 517† | 19 244‡ | 89.9 | – |
2 | 3 years | 2004–2005 | 15 808 | 15 590 | 78.2 | 14 898 |
3 | 5 years | 2006–2007 | 15 459 | 15 246 | 79.2 | 13 234 |
4 | 7 years | 2008 | 14 043 | 13 857 | 81.1 | 11 721 |
5 | 11 years | 2012–2013 | 13 469 | 13 287 | 81.4 | 10 448 |
6 | 14 years | 2015 | 11 884 | 11 726 | 76.1 | 10 411 |
*Ages are approximate.
†Including 699 children recruited at wave 2.
‡Including 692 families recruited at wave 2.
MCS, Millennium Cohort Study.