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Percentage of participants with preserved C-peptide by duration of diabetes in 3-month intervals according to the DCCT definition (fasting C-peptide <0.23 ng/ml) (♦), NHANES 5th percentile definition (fasting C-peptide <1.0 ng/ml) (■), and NHANES 50th percentile definition (fasting C-peptide <1.9 ng/ml) (▴). N, number of participants in each 3-month interval.
