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. Author manuscript; available in PMC: 2008 May 15.
Published in final edited form as: Am J Kidney Dis. 2008 Mar 20;51(5):759–766. doi: 10.1053/j.ajkd.2008.01.011

Table 4.

C Statistic for Each Predictor Variable

Variable 1 ESRD C Statistic 1 SE 1 95% CI Variable 2 C Statistic 2 SE 2 95% CI r P
 ACR0 0.920 0.011 0.898–0.942 ACR−1 0.895 0.012 0.872–0.919 0.81 <0.001
 ACR0 0.920 0.011 0.898–0.942 Covariates 0.839 0.015 0.810–0.868 0.51 <0.001
 ACR0 0.920 0.011 0.898–0.942 ACR−1 + ACR0 0.920 0.011 0.898–0.942 0.99 0.4
 ACR−1 0.895 0.012 0.872–0.919 Covariates 0.839 0.015 0.810–0.868 0.70 <0.001
 ACR−1 0.895 0.012 0.872–0.919 ACR−1 + ACR0 0.920 0.011 0.898–0.942 0.81 <0.001
 Covariates 0.839 0.015 0.810–0.868 ACR−1 + ACR0 0.920 0.011 0.898–0.942 0.51 <0.001
Natural mortality
 ACR0 0.812 0.015 0.783–0.841 ACR−1 0.810 0.015 0.781–0.839 0.97 0.8
 ACR0 0.812 0.015 0.783–0.841 Covariates 0.800 0.015 0.771–0.829 0.90 0.1
 ACR0 0.812 0.015 0.783–0.841 ACR−1 + ACR0 0.812 0.015 0.783–0.841 0.99 0.1
 ACR−1 0.810 0.015 0.781–0.839 Covariates 0.800 0.015 0.771–0.829 0.94 0.06
 ACR−1 0.810 0.015 0.781–0.839 ACR−1 + ACR0 0.812 0.015 0.783–0.841 0.97 0.6
 Covariates 0.800 0.015 0.771–0.829 ACR−1 + ACR0 0.812 0.015 0.783–0.841 0.90 0.08

Note: Covariates included sex, baseline age, diabetes duration, and antihypertensive medication. P refers to pairwise comparison between c statistic 1 and c statistic 2, and r is correlation between the 2 statistics introduced by studying the same sample of people.

Abbreviations: ESRD, end-stage renal disease; ACR0, second ACR measurement; ACR−1, first ACR measurement; ACR, albumin-creatinine ratio.