Estimating Renal Function in the Elderly Malaysian Patients Attending Medical Outpatient Clinic: A Comparison between Creatinine Based and Cystatin-C Based Equations

Table 3

Correlation coefficient (), mean, bias, precision, and accuracy for CGBSA, 4-MDRD, CKD-EPIcr, and CKD-EPIcys equations.

	Correlation coefficient; ()	Mean GFR; (ml/min/1.73 m^2)	Range (IQR)		Mean difference; (bias)	SD of mean bias; (precision)	Accuracy within; 30%
			Lower	Upper
Measured GFR		41.2	17.7	98.3
CGBSA
4-MDRD
CKD-EPIcr
CKD-EPIcys

correlates with (bias: mean difference of estimated GFR and measured GFR; accuracy: percentage of GFR estimates within % of measured GFR; IQR: interquartile range).