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. 2019 Mar 12;321(10):957–968. doi: 10.1001/jama.2019.1432

Figure 1. Flowchart of Sample Selection for Whitehall II Study.

Figure 1.

The end of follow-up for dementia occurred on March 31, 2017. There was continuous linkage for dementia ascertainment throughout all of the years of follow-up.

aAt each wave of data collection, individuals participated in at least 1 part of the clinical examination (providing data from the food frequency questionnaire [1991-1993, 1997-1999, 2002-2004], from the cognitive examination [1997-1999, 2002-2004, 2007-2009, 2012-2013, 2015-2016], or on the covariates).