Fig. 1From: Lower serum sodium levels predict poor clinical outcomes in patients with insomniaAssociation between serum sodium level and hazard ratios for all-cause mortality. The log hazard ratios for all-cause mortality (solid line) and 95% confidence index (dashed lines) are presented. Knots were located at serum sodium values of 137.7 and 140.8 mmol/l, corresponding to the 35th, and 70th percentilesBack to article page