Scatterplots with linear predictions, Pearson correlation coefficients, and unadjusted β coefficients (95% CIs) from linear regressions of z scores of markers of hyperglycemia (standardized to visit 2) on age (visit 2: 1990–1992 and visit 5: 2011–2013). HbA_1c (A), fasting glucose (B), fructosamine (C), and glycated albumin (D). Black circles, visit 2 biomarker values; white line, visit 2 linear prediction; white circles, visit 5 biomarker values; black line, visit 5 linear prediction. *P < 0.05, **P < 0.001.