Estimation of salt intake from spot urine samples in patients with chronic kidney disease

BMC Nephrology

Table 2 Performance of urinary sodium estimating equation

eGFR	n	Median bias	Median percentage bias	IQR	RMSE	P30
mL/min		(95% CI)	%	mEq/day	mEq/day	%
eGFR <30	22	0.0 (-14.2-24.1)	0.0	46	34	82
eGFR 30-60	39	9.0 (-1.0-19.4)	5.9	48	48	72
eGFR >60	35	-2.0 (-5.8-16.3)	-1.3	67	60	60
Overall	96	4.5 (-2.1-12.2)	2.7	53	50	70

eGFR: estimated glomerular filtration rate, IQR: interquartile range, RMSE: root mean square error, P30: percentage of estimated sodium intake within 30% of measured sodium intake.

ISSN: 1471-2369