Cumulative incidence curves for type 1 diabetes in DPT-1 and PTP, based on time to peak glucose (A and B) or peak C-peptide (C and D) levels during 2-h OGTTs (P < 0.001 for all). Dashed lines indicate peak glucose after 30 min (A and B) or peak C-peptide after 60 min (C and D). Solid lines indicate peak glucose at 30 min (A and B) or peak C-peptide at 60 min (C and D). TN, TrialNet.