Table 1.

Pearson correlation coefficients relating Na/K ratio, Na and K concentration of casual urine with Na/K ratio, Na and K excretion of 24-h urine

		52 populations					10 065 individuals
		24-h urine collection					24-h urine collection
		Na/K ratio	Na excretion	K excretion	Na/Cr ratio	K/Cr ratio	Na/K ratio	Na excretion	K excretion	Na/Cr ratio	K/Cr ratio
Casual urine	Na/K ratio	0.96	0.72	–0.67	0.78	–0.57	0.69	0.42	–0.34	0.45	–0.33
	Na concentration	0.74	0.84	–0.42	0.66	–0.67	0.46	0.49	–0.14	0.36	–0.35
	K concentration	–0.79	–0.68	0.62	–0.68	0.68	–0.43	–0.24	0.33	–0.32	0.31
	Na/Cr ratio	0.62	0.83	–0.19	0.97	–0.22	0.37	0.42	–0.06	0.68	0.01
	K/Cr ratio	–0.71	–0.44	0.68	–0.28	0.97	–0.37	–0.14	0.36	0.02	0.67

Na, sodium; K, potassium; Cr, Creatinine. P < 0.001 for all coefficients. Units for Na and K concentrations are mmol/L. Units for Na and K excretions are mmol/24 h.