. 2014 Sep 11;9:1539–1549. doi: 10.2147/CIA.S68801

Table 6.

Age-specific performance of the equations

	Bias	Precision	Accuracy		Bias	Precision	Accuracy		Bias	Precision	Accuracy

	Median absolute difference	IQR of the median difference	P₃₀	RMSE	Median absolute difference	IQR of the median difference	P₃₀	RMSE	Median absolute difference	IQR of the median difference	P₃₀	RMSE

	Age 60–69 years				Age 70–79 years				Age 80+ years
Cscr-cys	9.06	17.13	86.75^*	14.91	7.91^**	16.60	85.42	14.54	10.53	24.04	78.05	15.80
Ccys	9.54	17.32	83.33	15.98	9.33	18.70	81.25	15.40	9.97	23.13	78.05	20.10
CEscr	9.71	19.99	8r5.90^**	15.93	10.10	20.73	82.64	15.23	10.71	23.12	68.29	16.44
BISscr-cys	10.94	16.54	83.76^**	16.46	10.53	15.91	77.78	16.93	12.42^**	24.44	63.41	19.47
BISscr	10.13	20.69	83.76^**	16.28	12.16^**	19.15	77.78	17.58	10.88	27.12	63.41	20.66
Jcys	14.00^*	18.11	70.51^**	20.28	12.04^**	10.43	69.44^**	18.75	14.90^*	25.13	58.54	22.54
Jscr	16.14^*	20.26	64.96^*	22.49	17.57^*	19.28	60.42^*	22.34	13.44^*	27.27	53.66^**	22.57
CKD-EPIscr-cys	10.21	18.38	79.91	15.08	9.55	20.21	79.17	15.03	12.13	22.53	70.73	17.34
CKD-EPIcys	12.13^**	18.85	72.22	18.90	10.90	19.92	72.92	17.41	14.32^**	23.41	65.85	19.91
CKD-EPIscr	11.21	22.48	79.06	15.57	9.58	19.16	80.56	15.64	10.23	25.84	73.17	16.69

Notes:

Median absolute difference = median value of absolute difference (|eGFR–rGFR|)

P<0.01

^**

P<0.05.

Abbreviations: BISscr, Berlin equation based on scr; BISscr-cys, Berlin equation based on scr and cys C; Ccys, Chinese equation based on cys C; CEscr, Chinese elderly equation based on scr; CKD-EPI, Chronic Kidney Disease Epidemiology Collaboration; CKD-EPIcys, CKD-EPI equation based on cys C; CKD-EPIscr, CKD-EPI equation based on scr; CKD-EPIscr-cys, CKD-EPI equation based on scr and cys C; Cscr-cys, Chinese equation based on scr and cys C; eGFR, estimated glomerular filtration rate; IQR, the interquartile range of difference; Jcys, Japanese equation based on cys C; Jscr, Japanese equation based on scr; P₃₀, the proportion of eGFR within 30% of rGFR; rGFR, reference glomerular filtration rate; RMSE, root mean square error; scr, serum creatinine; cys C, cystatin C.