Figure 4.
Comparison of serum metabolomes between progressors to type 1 diabetes and nonprogressors who remained autoantibody negative throughout the follow up. The age groups are divided into birth (cord blood) and then into groups covering 1-yr periods of followup. Only one sample per subject, closest to the mean age within the time window (0.5, 1.5, 2.5 yr, etc.), is used in each comparison. Clustering was performed for the profiles across all available samples (n = 419) using Ward linkage and the nonparametric Spearman rank correlation–based distance metric. The number of subjects included in each age cohort is shown at the bottom.