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Table 4 Correlation of sodium estimates obtained with various equations

From: Sodium intake in Germany estimated from sodium excretion measured in spot urine samples

  Brown [35] Kawasaki [33] Tanaka [32] Toft [31] Johner [28]  
Brown [35] - 0.170 0.294 0.469 0.164 women
(-0.081–0.410) (-0.085–0.571) (0.084–0.679) (0.081–0.241)
Kawasaki [33] 0.326 - 0.761 0.275 0.784
(-0.076–0.598) (-0.045–0.922) (-0.090–0.557) (0.598–0.869)
Tanaka [32] 0.717 0.542 - 0.519 0.623
(0.700–0.734) (-0.081– 0.828) (-0.018–0.760) (0.603–0.643)
Toft [31] 0.464 0.816 0.706 - 0.275
(-0.083–0.743) (0.414–0.917) (-0.007–0.922) (0.203–0.341)
Johner [28] 0.267 0.750 0.523 0.572 -  
(0.220–0.311) (0.567–0.841) (0.456–0.581) (0.545–0.597)
  Men   
  1. ICC matrix (with 95 % CI) of estimated daily sodium excretion calculated with various methods stratified by sex