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Participants were asked about diabetes status at every research clinic visit, except Visit 2.  All of the data in this section is based on self-report.  For diabetes medications based on review of medications brought to research clinic visits, see the Medications data group. For biological measures of diabetes, including fasting and post-challenge plasma glucose levels, see the Labs data group.  Fasting glucose levels were obtained at Visit 1 through Visit 10; 2hr oral glucose tolerance tests were performed at Visit 4 and Visit 7.