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Healthy control samples were divided into 5 year groupings and WBLogTREC/ml determined. The mean (thick bar), inter-quartile range (boxes) and 95% confidence intervals (whiskers) are plotted. Outliers are plotted as stars (⁎). Age was negatively correlated with WBLogTREC/ml (Pearson's r = − 0.86; p < 0.01).
