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Table 5 Mean bias limit of agreement between 24-h urinary sodium and new predicting equation, TANAKA and INTERSALT equations

From: Development and double cross-validation of new spot urine sodium equation to predict 24-h urine sodium in the Malaysian population

Equation Mean bias
(95% CI)
Upper limit Lower limit
Predicting equation − 0.35 (− 72.26, 71.56) 1986.89 − 1987.60
Tanaka1 629.83 (532.19, 727.47) 3327.99 − 2068.33
INTERSALT2 360.82 (284.34, 437.29) 2473.99 − 1752.35
  1. 1Tanaka, equation (2.54 ÷ 1000 × 23 × [spotNa (mmol/L)/(spotCr (mg/dL) × 10] × [− 2.04 × age (years) + 14.89 × weight (kg) + 16.14 × height (cm) − 224.45]}0.392
  2. 2INTERSALT, equation (male: 2.54 ÷ 1000 × 23 {25.46 + [0.46 × spotNa (mmol/L)] − [2.75 × spotCr (mmol/L)] − [0.13 × spot K (mmol/L)] + [4.10 × BMI ] + [0.26 × age]. Female: 2.54 ÷ 1000 × 23 {5.07 + [0.34 × spotNa (mmol/L)] − [2.16 × spotCr( mmol/L)] − [0.09 × spot K (mmol/L)] + [2.39 × BMI ] + [2.35 × age − [0.03 × age2 (years)]