Fig. 5

Plots of sodium-to-potassium (Na/K) ratios of casual urine vs. 24-h urine, and Bland–Altman plots in normotensive and hypertensive individuals [52, 57]. (a) Normotensive individuals (scattered plots); (b) hypertensive individuals (scattered plots); (c) normotensive individuals (Bland–Altman plots); and (d) hypertensive individuals (Bland–Altman plots)