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Whitehall II data collection

Phases of data collection


Phase Dates Type Number of participants Response Rate
1 1985-1988 Screening / questionnaire 10,308 73% of those invited
2 1989-1990 Questionnaire 8,132 79% of Phase 1 responders
3 1991-1994 Screening / questionnaire 8,815 86% of Phase 1 responders
4 1995-1996 Questionnaire 8,628 84% of Phase 1 responders
5 1997-1999 Screening / questionnaire 7,870 76% of Phase 1 responders
6 2001 Questionnaire 7,355 71% of Phase 1 responders
7 2002-2004 Screening / questionnaire 6,967 68% of Phase 1 responders
8 2006 Questionnaire 7,173 70% of Phase 1 responders
9 2007-2009 Screening / questionnaire 6,761 66% of Phase 1 responders
10 (Pilot*)
Feb-Mar 2011 Screening / questionnaire 277 84% of those invited
11 2012-2013 Screening / questionnaire 6,318 61% of Phase 1 responders
12
2015-2016
Screening / questionnaire
Planning  

*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.

Ethical Approval and Consent

The study is approved by the Joint UCL/UCLH Committees on the Ethics of Human Research (Committee Alpha).

All participants are asked to give written informed consent (see example here)

Page last modified on 16 may 14 19:46