Table 3. Agreement between MDRD Study equation and other equations.

	GFR category	MDRD Study							Categorical agreement		Diagnostic agreement at specific eGFR cutoffs
		G1	G2	G3a	G3b	G4	G5	Total	%	Weighted kappa (95% CI)	Kappa at 60 mL/min/1.73 m2 (95% CI)	Kappa at 45 mL/min/1.73 m2 (95% CI)
CKD-EPICr	G1	119	297	0	0	0	0	416	76.0	0.521 (0.474–0.568)	0.729 (0.662–0.796)	0.961 (0.907–1.000)
	G2	0	927	56	0	0	0	983
	G3a	0	0	56	02	0	0	58
	G3b	0	0	0	18	0	0	18
	G4	0	0	0	0	6	0	6
	G5	0	0	0	0	0	1	1
CKD-EPICysC	G1	113	1,047	43	7	2	0	1,212	20.3	0.067 (0.047–0.087)	0.259 (0.173–0.346)	0.415 (0.217–0.613)
	G2	4	169	54	4	4	0	235
	G3a	2	7	13	2	0	0	24
	G3b	0	1	2	6	0	1	10
	G4	0	0	0	1	0	0	1
	G5	0	0	0	0	0	0	0
CKD-EPICr-CysC	G1	113	865	4	0	0	0	982	33.3	0.139 (0.111–0.167)	0.402 (0.313–0.492)	0.595 (0.415–0.776)
	G2	6	358	92	5	0	0	461
	G3a	0	1	15	7	3	0	26
	G3b	0	0	1	7	3	0	11
	G4	0	0	0	1	0	1	2
	G5	0	0	0	0	0	0	0
LMrevised	G1	103	6	0	0	0	0	109	93.8	0.823 (0.788–0.859)	0.737 (0.674–0.799)	0.962 (0.910–1.000)
	G2	16	1,197	41	0	0	0	1,254
	G3a	0	21	70	1	0	0	92
	G3b	0	0	1	13	0	0	14
	G4	0	0	0	6	6	0	12
	G5	0	0	0	0	0	1	1
Total		119	1,224	112	20	6	1	1,482

Abbreviations: CI, confidence interval; See Table 1.