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Overview of CHS Data Collection

Between enrollment and 1998-99, participants were seen in the clinic annually, and contacted by phone at 6-month intervals. For more details set the summary & frequency of types of clinic visit data collected.

Since 1999, participants have been contacted every 6 months by phone, primarily to ascertain health status for events follow-up.

Between April 2005 and April 2006, CHS participants in the CHS All Stars Study were seen in person or by phone to assess physical and cognitive function.