TABLE 4.

Comparison the correlation between the estimated 24‐hour urinary sodium excretion rate by the four spot sodium methods and the measured 24‐hour urinary sodium excretion

Categories	Measured 24‐hour USE	Estimated value by Kawasaki	Estimated value by Tanaka	Estimated value by INTERSALT
Pearson coefficient	Ref.	0.43*	0.38*	0.27*
ICC (95% CI)	Ref.	0.47	0.40	0.27
		(0.38–0.55)	(0.25–0.47)	(0.17–0.37)

Correlation and reliability comparison between the estimated values by Kawasaki method, Tanaka method, INTERSALT method, and SH2 method and the measured values by 24‐hour urinary sodium method.

Abbreviations: ICC, intraclass correlation coefficient; INTERSALT, International Cooperative Study on Salt, Other Factors, and Blood Pressure; USE, urinary sodium excretion.

^* P < .01.