Mean A1C stratified by age: A comparison of T1D Exchange and T1PCO data

For the T1D Exchange data set, the average A1C for each year of age was plotted using the most recent value available for each of the 16,057 participants with a recent update. Participants <4 years old were grouped at age 4, and participants >75 years old were grouped at age 75. For the T1PCO data set, the average A1C for each year of age was plotted using the most recent value available for a random sample of 16,000 participants. Participants >85 years old were grouped at age 85. The lines were estimated using LOESS, a nonparametric method for estimating the regression equation that fits a smoothing parameter. Circles represent the mean A1C for each year of age. The gray shaded area represents the 95% CI around the smoothed LOESS line.