Fig. 1 | Hypertension Research

Fig. 1

From: Meta-analytic research of the dose-response relationship between salt intake and risk of heart failure

Fig. 1

Cubic regression curve explaining the relationship between 24-h urine Na excretion (UNa) and relative risk (RR) for incident HF in a semilogarithmic scatter plot. Knots in this curve are at 3.0 g/day and 4.0 g/day of UNa. The area of each black circle shows its statistical weight (inverse of the standard deviation). The RR for HF was adjusted for UNa in the reference group of each study

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