Icons / Login Created with Sketch.
Icons / User Created with Sketch.

Cohort participation and retention

Timeline of surveys since 1996

 Cohort1989-951973-781946-511921-26
Survey 1Year (age range)2013 (18-23)1996 (18-23)1996 (45-50)1996 (70-75)
Respondents (N)17011142471371412432
Survey 2Year (age range)2014 (19-24)2000 (22-27)1998 (47-52)1999 (73-78)
Respondents (N)1134496881233810434
Survey 3Year (age range)2015 (20-25)2003 (25-30)2001 (50-55)2002 (76-81)
Respondents (N)89619081112268646
Survey 4Year (age range)2016 (21-26)2006 (28-33)2004 (53-58)2005 (79-84)
Respondents (N)90079145109057158
Survey 5Year (age range)2017 (22-27)2009 (31-36)2007 (56-61)2008 (82-87)
Respondents (N)84958199106385560
Survey 6Year (age range)2019 (24-29)2012 (34-39)2010 (59-64)2011 (85-90)
Respondents (N)83468009100114055
Survey 7Year (age range)2015 (37-42)2013 (62-67)Surveyed at six
monthly intervals
from November 2011
(see next table)
Respondents (N)71869151
Survey 8Year (age range)2018 (40-45)2016 (65-70)
Respondents (N)71218622
Survey 9Year (age range)2019 (68-73)
Respondents (N)7956

1921-26 Cohort: number of respondents for each six-monthly follow up (6MF)

SurveyTotal (N)Year submitted2011201220132014201520162017201820192020
Age range (years)85-9086-9187-9288-9389-9490-9591-9692-9893-9994-100
6MF1385528299436113241200
6MF233923069253431581531
6MF329891649117410130168641
6MF426182202301602681254
6MF52303917116513843151276
6MF620181584297693319115
6MF71751591957123382877
6MF8153310683565931154
6MF913394407121433662
6MF101182178530764250
6MF111028262591130441
6MF128755482575713
6MF137241624539910
6MF1462040219226
6MF1548811731160
6MF16386264122
6MF1725772185
6MF18112112
From November 2011, shorter surveys containing a set of core questions were mailed to the 1921-26 cohort every six months after the return of the previous survey.
This six monthly survey has no finish date and therefore we continue to receive surveys for each wave.
Each row shows the total number of respondents, followed by the number of responses made each year, for each individual wave.