Table 2. Overall limits of agreement between eGFR and rGFR (n = 101).

	mean±SD	correlation analysis		Bland-Altman analysis
		r	P	Mean differences	95% AL	acceptable limits*	Out of limitsn (%)
rGFR	54.16±29.45	-	-	-	-	-	-
eGFR1	56.60±29.70	0.7734	0.0000	−2.4	−51.8–46.9	98.7	6(5.94)
eGFR2	58.21±44.50	0.7774	0.0000	−4.1	−59.8–51.7	111.5	4(3.96)
eGFR3	48.44±±30.04	0.8600	0.0000	5.7	−25.2–36.6	61.8	5(4.95)
eGFR4	51.00±35.10	0.8510	0.0000	3.2	−33.0–39.3	72.3	6(5.94)
eGFR5	55.06±32.68	0.8600	0.0000	−0.9	−33.7–31.9	65.6	5(4.95)
eGFR6	56.96±39.07	0.8556	0.0000	−2.8	−43.2–37.6	80.8	5(4.95)
eGFR7	54.47±28.06	0.8729	0.0000	−0.3	−28.8–28.2	57.0	7(6.93)
eGFR8	52.59±27.07	0.8591	0.0000	1.6	−28.2–31.3	59.5	7(6.93)

Note: Units are mL/min·1.73 m²; 95% AL, 95% agreement limits. *Acceptable tolerance for the difference between rGFR and eGFR was defined as 60 mL/min/1.73 m². r is the Person's correlation coefficient between eGFR and rGFR.