Data normalization process.

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Presentation transcript:

Data normalization process. Data normalization process. The data normalization process is shown for KS and for serum creatinine. Nonlinear equations were used to calculate the best fitting function of each parameter as a function of height, weight, age, and gender, and residuals were corrected for heteroscedasticity (A and D). This allowed expressing data as SDS that followed a normal distribution (B and E). Once expressed as SDS, values were homogeneously distributed on both sides of the mean, independently of height, weight, age, and gender (C and F). Thinner lines in A, C, D, and F indicate +1SD and −1SD. The same process was used to generate SDS for BUN, SBP, and DBP (data not shown). aKS was calculated using a best-fitting model (equation 1 in online supplementary material). Giacomo Di Zazzo et al. CJASN 2011;6:107-113 ©2011 by American Society of Nephrology