Table 4.

C-statistics in groups with albumin-creatinine ratio, protein-to-creatinine ratio/dipstick, and no urine testing within 3 yr

Health Care Organization Identification	Group 1: Has Albumin-Creatinine Ratio Test		Group 2: Has Protein-To-Creatinine Ratio Test		Group 3: Has Proteinuria Dipstick Test		Group 4: Has No Albuminuria Test
Health Care Organization Identification	Three-variable	Four-variable	Three-variable	Four-variable	Three-variable	Four-variable	Three-variable
1	0.840	0.888			0.894	0.922	0.872
2	0.860	0.912			0.902	0.917	0.915
3	0.794	0.836			0.915	0.935	0.865
4	0.886	0.909			0.911	0.929	0.931
5	0.869	0.907
6	0.856	0.894	0.790	0.804	0.876	0.888	0.885
7	0.866	0.920					0.900
8	0.905	0.921			0.920	0.940	0.911
9	0.852	0.898					0.931
10	0.826	0.861	0.840	0.864	0.876	0.895	0.887
11	0.862	0.919			0.840	0.863	0.877
12	0.859	0.892			0.925	0.937	0.869
13	0.815	0.879	0.867	0.888	0.867	0.892
14	0.843	0.884	0.845	0.877	0.851	0.841	0.903
15	0.894	0.912			0.887	0.900	0.923
16	0.867	0.900	0.803	0.830	0.916	0.916	0.889
17	0.864	0.903			0.885	0.902	0.901
18	0.871	0.925	0.840	0.866			0.926
19	0.880	0.897	0.817	0.823	0.855	0.864	0.897
20	0.867	0.909			0.898	0.914	0.921
21	0.854	0.891			0.879	0.887	0.922
22	0.812	0.849			0.898	0.906	0.881
23	0.867	0.897			0.902	0.917	0.960
24	0.903	0.930			0.901	0.918	0.868
25	0.891	0.932			0.892	0.913	0.927
26	0.833	0.877			0.817	0.824	0.882
27	0.851	0.905			0.897	0.908	0.862
28	0.838	0.889	0.763	0.789	0.851	0.868	0.867
29	0.852	0.876			0.884	0.894	0.889
30	0.762	0.854			0.879	0.889	0.898
31	0.844	0.885			0.904	0.915	0.906
32	0.842	0.882			0.877	0.868	0.921
33	0.860	0.895			0.835	0.833	0.930
34	0.870	0.915			0.843	0.850	0.932
35	0.829	0.881	0.852	0.884	0.859	0.881	0.889
36	0.844	0.883			0.861	0.878	0.881
37	0.833	0.868	0.794	0.814	0.887	0.901	0.929
38	0.897	0.930
39	0.845	0.893			0.869	0.888	0.887
Median C-statistic	0.856	0.895	0.828	0.847	0.885	0.897	0.899
	Meta-analyzed difference in C-statistic		Meta-analyzed difference in C-statistic		Meta-analyzed difference in C-statistic
	0.039 (0.036–0.043)		0.022 (0.017–0.026)		0.012 (0.010–0.015)

Group 1, available ACR test. Group 2, available PCR, but no available ACR. Group 3, available urine dipstick protein level measurement, but no available ACR or PCR. Group 4, no form of albuminuria measured. Bold indicates that the difference in C-statistic between the 4-variable and 3-variable KFRE in the group is statistically significant. ACR, albumin-creatinine ratio; PCR, protein-to-creatinine ratio.