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1946-51 cohort

Retention has been much higher among the 1946-51 cohort of women; 92% responded to Survey 2 in 1998, 85% responded to Survey 3 in 2001, Survey 4 in 2004 and Survey 5 in 2007, and 83% responded to Survey 6 in 2010, 81% to Survey 7 in 2013 and 80% to Survey 8 in 2016 (See Table below). The major reasons for non-response among the 1946-51 cohort has been that the research team has been unable to contact the women (6% to 8% of eligible women between Survey 2 and Survey 6), and non-return of questionnaires by women who could be contacted (2% at Survey 2 and 7% to 10% of eligible women at subsequent surveys).

Participation and retention of 13,714 women in the 1946-51 cohort of women who were 45-50 years old at the first survey in 1996

Year
Survey
Age in years
1998
Survey 2
47-52
2001
Survey 3
50-55
2004
Survey 4
53-58
2007
Survey 5
56-61
2010
Survey 6
59-64
2013
Survey 7
62-67
2016
Survey 8
65-70
2019
Survey 9
68-73
Deceased501192163294756748761171
Frailty (e.g. dementia, stroke)723345170100120128
Withdrawn2094246228691107165020022082
Total ineligible26656687212491652242429983381
Contacted but did not return survey25499788699511481051714718
Unable to contact participant8569251051832903108813801659
Total non-respondents11101922193718282051213920942377
Respondents completed survey1233811226109051063810011915186227956
Eligible at current survey1344813148128421246512062112901071610333
Retention rate as % eligible91.7%85.4%84.9%85.3%83.0%81.1%80.5%77%
Data known as at 2nd July 2021