A more accurate method acquirement by a comparison of the prediction equations for estimating glomerular filtration rate in Chinese patients with obstructive nephropathy

Table 5 Performance of the equations in subgroups

Variable	Subgroup	7MDRD			aMDRD			re-aMDRD			CKD-EPIcr			CKD-EPIcys			CKD-EPIcr-cys
Variable	Subgroup	B	P	A(30 %)	B	P	A(30 %)	B	P	A(30 %)	B	P	A(30 %)	B	P	A(30 %)	B	P	A(30 %)
GFR (ml/min/1.73 m²)	<60	13.83	24.39	40.86	15.20	25.13	39.78	11.82	23.57	43.01	14.88	23.90	37.63	0.27	19.33	52.69	5.49	19.83	51.61
	60–90	13.69	19.51	64.86	16.84	21.39	59.46	11.46	20.19	68.47	16.92	18.21	54.95	−2.15	19.45	76.58	5.90	17.64	76.58
	>90	4.08	28.73	75.61	8.18	30.63	68.29	1.68	28.91	78.05	1.19	20.60	87.80	−20.11	17.39	78.05	−10.62	16.94	90.24
Age (year)	<45	17.39	28.23	55.22	18.48	29.66	50.75	12.87	27.96	61.19	19.25	24.86	47.76	−1.24	22.72	71.64	6.92	22.09	64.18
	45–60	10.48	21.54	59.29	13.76	23.13	56.64	8.92	21.91	64.60	12.44	20.14	56.64	−4.66	19.96	72.57	2.31	18.00	75.22
	>60	9.61	20.04	12.70	12.70	21.28	50.77	8.77	20.39	52.31	9.45	19.39	55.38	−6.60	18.16	55.38	0.07	18.05	64.62
Gender	Male	11.80	23.19	64.12	14.53	24.31	56.49	9.83	22.85	64.12	12.24	20.12	59.45	−4.30	20.33	67.18	2.49	18.47	73.28
Gender	Female	12.52	23.59	50.00	15.05	25.13	50.00	10.11	23.96	56.14	14.97	23.15	47.37	−4.17	20.40	68.42	3.54	20.30	64.91
Number of obstructed kidney	Unilateral	15.47	23.16	58.43	18.4	24.19	54.82	13.17	23.01	63.86	16.32	20.21	57.23	−2.74	19.87	72.29	5.29	18.59	74.70
Number of obstructed kidney	Bilateral	5.14	22.24	55.7	7.15	23.99	50.63	3.22	22.66	53.16	7.61	23.27	46.84	−7.38	21.03	58.23	−1.88	20.00	58.23
Disease duration	≥3 months	11.19	25.75	60.61	13.52	26.83	54.55	8.62	25.48	65.91	16.13	20.43	47.79	−3.13	18.47	73.45	4.65	17.13	70.80
Disease duration	<3 months	13.24	20.2	53.98	16.24	21.73	52.21	11.53	20.54	53.98	11.28	22.36	59.09	−5.19	21.81	62.88	1.55	20.96	68.18

Bias was calculated as the mean difference between estimated and measured GFR. Precision was the SD of this difference. Accuracy (≤30 %) was the percentage of results deviating by 30 % from the measured GFR

ISSN: 1471-2369