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Table 2 Performance of urinary sodium estimating equation

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

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
  1. 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.