Table 2.

Agreement between different kidney function estimators in diagnosing CKD stage 3–5 (kappa statistic and 95% confidence interval)

Estimator 1	Estimator 2	Men	Women	Total
Cockcroft-Gault	MDRD corrected	0.27 (0.13-0.40)	0.60 (0.52-0.68)	0.51 (0.44-0.58)
	MDRD	0.57 (0.44-0.70)	0.52 (0.45-0.58)	0.53 (0.47-0.59)
	CKD-EPI corrected	0.35 (0.20-0.47)	0.66 (0.58-0.74)	0.57 (0.49-0.64)
	CKD-EPI	0.64 (0.52-0.76)	0.65 (0.59-0.72)	0.65 (0.59-0.71)
MDRD corrected	MDRD	0.46 (0.30-0.60)	0.41 (0.34-0.47)	0.42 (0.36-0.48)
	CKD-EPI corrected	0.87 (0.71-0.97)	0.92 (0.87-0.96)	0.91 (0.86-0.95)
	CKD-EPI	0.53 (0.34-0.70)	0.57 (0.49-0.65)	0.57 (0.50-0.64)
MDRD	CKD-EPI corrected	0.51 (0.35-0.64)	0.38 (0.32-0.45)	0.41 (0.34-0.47
	CKD-EPI	0.85 (0.74-0.93)	0.78 (0.72-0.82)	0.79 (0.74-0.83)
CKD-EPI corrected	CKD-EPI	0.58 (0.43-0.73)	0.54 (0.46-0.61)	0.55 (0.48-0.62)

CG, Cockcroft-Gault; CKD-EPI, Chronic Kidney Disease Collaboration Epidemiology; DBP, 4-v-MDRD, four variable Modification of Diet in Renal Disease.