Table 2.

Hazard ratios for 90-day mortality according to the measured sodium level

	Measured sodium	N	Mortality (%)	Model 1	Model 2	Model 3
Total		755	130 (17.2)
Severe hyponatremia	≤ 125	128	22 (17.2)	1.66 (0.93–2.98)	1.69 (0.94–3.04)	1.67 (0.84–3.32)
Moderate hyponatremia	126–130	212	23 (10.8)	1 [Reference]	1 [Reference]	1 [Reference]
Mild hyponatremia	131–134	166	21 (12.7)	1.19 (0.66–2.16)	1.18 (0.65–2.13)	1.40 (0.72–2.72)
Normonatremia	135–145	191	41 (21.5)	2.20 (1.32–3.66)	2.04 (1.22–3.41)	2.10 (1.16–3.81)
Hypernatremia	≥ 146	58	23 (39.7)	4.56 (2.56–8.14)	4.00 (2.22–7.18)	2.86 (1.39–5.87)