Survey timeline and participant numbers
ALSWH began in 1996, when over 14,000 women aged 18-23 (born 1973-78), over 13,500 women aged 45-50 (born 1946-51) and just under 12,500 women aged 70-75 (born 1921-26) completed their first survey. Surveys are generally conducted in a three yearly cycle – e.g., the 1946-51 cohort completed Survey 2 in 1998, the 1921-26 cohort completed their Survey 2 in 1999, and the 1973-78 cohort in 2000. From November 2011 the oldest cohort, women born 1921-26, have been surveyed at six-monthly intervals. A new cohort of young women, aged 18-23 (born 1989-95), was recruited in 2013. This cohort was surveyed annually from 2013 – 2018 (Surveys 1 -6). Survey 7 will be deployed in 2023 and will follow a three yearly cycle thereafter.
Timeline of surveys since 1996
Cohort | 1989-95 | 1973-78 | 1946-51 | 1921-26 | |
---|---|---|---|---|---|
Survey 1 | Year (age range) | 2013 (18-23) | 1996 (18-23) | 1996 (45-50) | 1996 (70-75) |
Respondents (N) | 17010 | 14247 | 13714 | 12432 | |
Survey 2 | Year (age range) | 2014 (19-24) | 2000 (22-27) | 1998 (47-52) | 1999 (73-78) |
Respondents (N) | 11344 | 9688 | 12338 | 10434 | |
Survey 3 | Year (age range) | 2015 (20-25) | 2003 (25-30) | 2001 (50-55) | 2002 (76-81) |
Respondents (N) | 8961 | 9081 | 11226 | 8646 | |
Survey 4 | Year (age range) | 2016 (21-26) | 2006 (28-33) | 2004 (53-58) | 2005 (79-84) |
Respondents (N) | 9007 | 9145 | 10905 | 7158 | |
Survey 5 | Year (age range) | 2017 (22-27) | 2009 (31-36) | 2007 (56-61) | 2008 (82-87) |
Respondents (N) | 8495 | 8199 | 10638 | 5560 | |
Survey 6 | Year (age range) | 2019 (24-29) | 2012 (34-39) | 2010 (59-64) | 2011 (85-90) |
Respondents (N) | 8346 | 8009 | 10011 | 4055 | |
Survey 7 | Year (age range) | 2023 (28-33) | 2015 (37-42) | 2013 (62-67) | Surveyed at six monthly intervals from November 2011 (see next table) |
Respondents (N) | in progress | 7186 | 9151 | ||
Survey 8 | Year (age range) | 2018 (40-45) | 2016 (65-70) | ||
Respondents (N) | 7121 | 8622 | |||
Survey 9 | Year (age range) | 2021 (43-49*) | 2019 (68-73) | ||
Respondents (N) | 6875 | 7956 |
Data known as at 20th April 2023.
*This is more than the usual 5 year age range because the survey was open for 17 months due to COVID-19.
1921-26 Cohort: number of respondents for each six-monthly follow up (6MF)
Survey | Total (N) | Year submitted: | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Age range (years): | 85-90 | 86-91 | 87-92 | 88-93 | 89-94 | 90-95 | 91-96 | 92-98 | 93-99 | 94-100 | 95-101 | 96-102 | 97-103 | ||
6MF1 | 3855 | 2829 | 945 | 59 | 13 | 2 | 4 | 1 | 2 | 0 | 0 | 0 | 0 | 0 | |
6MF2 | 3395 | 3069 | 248 | 45 | 14 | 8 | 1 | 5 | 3 | 1 | 1 | 0 | 0 | ||
6MF3 | 2993 | 1651 | 1178 | 96 | 33 | 16 | 8 | 6 | 4 | 1 | 0 | 0 | 0 | ||
6MF4 | 2623 | 2216 | 292 | 57 | 27 | 8 | 12 | 5 | 4 | 2 | 0 | 0 | |||
6MF5 | 2311 | 921 | 1169 | 133 | 41 | 16 | 13 | 7 | 7 | 3 | 1 | 0 | |||
6MF6 | 2032 | 1591 | 299 | 64 | 33 | 18 | 11 | 8 | 5 | 3 | 0 | ||||
6MF7 | 1780 | 595 | 985 | 110 | 35 | 29 | 8 | 9 | 6 | 3 | 0 | ||||
6MF8 | 1556 | 1129 | 311 | 52 | 28 | 17 | 9 | 7 | 3 | 0 | |||||
6MF9 | 1376 | 439 | 737 | 133 | 33 | 14 | 9 | 6 | 5 | 0 | |||||
6MF10 | 1215 | 823 | 285 | 55 | 23 | 17 | 7 | 5 | 0 | ||||||
6MF11 | 1064 | 260 | 612 | 124 | 44 | 15 | 5 | 2 | 2 | ||||||
6MF12 | 911 | 569 | 252 | 54 | 22 | 8 | 6 | 0 | |||||||
6MF13 | 778 | 160 | 477 | 96 | 23 | 19 | 3 | 0 | |||||||
6MF14 | 673 | 413 | 194 | 38 | 17 | 10 | 1 | ||||||||
6MF15 | 555 | 116 | 329 | 71 | 24 | 13 | 2 | ||||||||
6MF16 | 461 | 274 | 139 | 34 | 12 | 2 | |||||||||
6MF17 | 374 | 79 | 224 | 51 | 15 | 5 | |||||||||
6MF18 | 304 | 170 | 103 | 27 | 4 | ||||||||||
6MF19 | 242 | 43 | 155 | 43 | 1 | ||||||||||
6MF20 | 192 | 110 | 69 | 13 | |||||||||||
6MF21 | 137 | 26 | 91 | 20 | |||||||||||
6MF22 | 85 | 56 | 29 | ||||||||||||
6MF23 | 30 | 8 | 22 |
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.
Years each cohort was surveyed
Cohort | 1921‑26 | 1946‑51 | 1973‑78 | 1989‑95 |
---|---|---|---|---|
Survey 1 | 1996 | 1996 | 1996 | 2013 |
Survey 2 | 1999 | 1998 | 2000 | 2014 |
Survey 3 | 2002 | 2001 | 2003 | 2015 |
Survey 4 | 2005 | 2004 | 2006 | 2016 |
Survey 5 | 2008 | 2007 | 2009 | 2017 |
Survey 6 | 2011 | 2010 | 2012 | 2019 |
Survey 7 | * | 2013 | 2015 | ^2023 |
Survey 8 | 2016 | 2018 | ||
Survey 9 | 2019 | 2021 | ||
Survey 10 | ^2022 |
*Surveyed at six monthly intervals from November 2011
^Surveys still in progress
Age range of cohort at each survey
Cohort | 1921‑26 | 1946‑51 | 1973‑78 | 1989‑95 |
---|---|---|---|---|
Survey 1 | 70-75 | 45-50 | 18-23 | 18-23 |
Survey 2 | 73-78 | 47-52 | 22-27 | 19-24 |
Survey 3 | 76-81 | 50-55 | 25-30 | 20-25 |
Survey 4 | 79-84 | 53-58 | 28-33 | 21-26 |
Survey 5 | 82-87 | 56-61 | 31-36 | 22-27 |
Survey 6 | 85-90 | 59-64 | 34-39 | 23-28 |
Survey 7 | * | 62-67 | 37-42 | |
Survey 8 | 65-70 | 40-45 | ||
Survey 9 | 68-73 |
*Surveyed at six monthly intervals from November 2011
^Surveys still in progress
Number of respondents per survey
Cohort | 1921‑26 | 1946‑51 | 1973‑78 | 1989‑95 |
---|---|---|---|---|
Survey 1 | 12432 | 13714 | 14247 | 17011 |
Survey 2 | 10434 | 12338 | 9688 | 11344 |
Survey 3 | 8646 | 11226 | 9081 | 8961 |
Survey 4 | 7158 | 10905 | 9145 | 9007 |
Survey 5 | 5560 | 10638 | 8199 | 8495 |
Survey 6 | 4055 | 10011 | 8009 | ^ |
Survey 7 | * | 9151 | 7186 | |
Survey 8 | 8622 | 7121 | ||
Survey 9 | 7956 |
*Surveyed at six monthly intervals from November 2011
^Surveys still in progress