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Up to date, we have collected a very wide range of clinical and self-reported information on our participants.
| Phase | Dates | Type | Participation | Response rate (alive) | Response rate (eligible*) |
| 1 | 1985-1988 | Questionnaire 1 & Clinic | 10,308 | -reference- | -reference- |
| 2 | 1989-1990 | Questionnaire 2 | 8,132 | 79.3% | 79.3% |
| 3 | 1991-1994 | Questionnaire 3 & Clinic | 8,815 | 86.6% | 86.6% |
| 4 | 1995-1996 | Questionnaire 4 | 8,628 | 85.3% | 92.4% |
| 5 | 1997-1999 | Questionnaire 5 & Clinic | 7,870 | 78.7% | 86.3% |
| 6 | 2001 | Questionnaire 6 | 7,355 | 74.4% | 82.5% |
| 7 | 2002-2004 | Questionnaire 7 & Clinic | 6,967 | 71.6% | 82.2% |
| 8 | 2006 | Questionnaire 8 | 7,173 | 75.2% | 87.2% |
| 9 | 2007-2009 | Questionnaire 9 & Clinic | 6,761 | 72.3% | 84.5% |
| 10 (**) | 2011 | Questionnaire 10 & Clinic | 277 | n/a | n/a |
| 11 | 2012-2013 | Questionnaire 11 & Clinic | 6,318 | 70.9% | 84.1% |
| 12 | 2015-2016 | Questionnaire 12 & Clinic | 5632 | 66.6% | 80.2% |
| 13 | 2019-2022 | Questionnaire 13 & Clinic | 4307 | 56.4% | 70.6% |
* Eligible: participants alive and not withdrawn from the study.
**Phase 10 was a pilot carried out in February and March 2011. A small group of Stress and Health participants were selected randomly and invited to attend our Phase 10 clinic. This enabled us to successfully pilot new measures for mental well-being introduced at Phase 11.
The study is approved by the London-Harrow Research Ethics Committee and the Scotland Research Ethics Committee. All participants who had clinical examination were asked to give written informed consent.
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Data Processing
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