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Cohort participation and retention

Timeline of surveys since 1996

Cohort1989-951973-781946-511921-26
Survey 12013 (age 18-23)1996 (age 18-23)1996 (age 45-50)1996 (age 70-75)
N=17 011N=14 247N=13 714N=12 432
Survey 22014 (age 19-24)2000 (age 22-27)1998 (age 47-52)1999 (age 73-78)
N=11 344N=9688N=12 338N=10 434
Survey 32015 (age 20-25)2003 (age 25-30)2001 (age 50-55)2002 (age 76-81)
N=8961N=9081N=11 226N=8646
Survey 42016 (age 21-26)2006 (age 28-33)2004 (age 53-58)2005 (age 79-84)
N=9007N=9145N=10 905N=7158
Survey 52017 (age 22-27)2009 (age 31-36)2007 (age 56-61)2008 (age 82-87)
N=8495N=8199N=10 638N=5560
Survey 62019 (age 24-29)2012 (age 34-39)2010 (age 59-64)2011 (age 90-95)
In progressN=8009N=10 011N=4055
Survey 72015 (age 37-42)2013 (age 62-67)Surveyed at six
monthly intervals
from November 2011
(see next table)
N=7186N=9151
Survey 82018 (age 40-45)2016 (age 65-70)
N=7121N=8622
Survey 92019 (age 68-73)
In progress

1921-26 Cohort, six-monthly follow up (6MF) showing year and age

Survey

Total number
Aged
2011
85-90
2012
86-91
2013
87-92
2014
88-93
2015
89-94
2016
90-95
2017
91-96
2018
92-98
2019
93-99
6MF1N=38552829945591324120
6MF2N=3393306924845148153
6MF3N=299216511178963316864
6MF4M=2614221629257278122
6MF5N=229792111691334116125
6MF6N=201315912996433188
6MF7N=176059598511035296
6MF8N=1529112931152289
6MF9N=13534397371333311
6MF10N=11858232855621
6MF11N=102726061212431
6MF12N=86556925244
6MF13N=71216047973
6MF14N=573415158
6MF15N=381116265
6MF16N=153153