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ORs in all models are compared with the reference category of non-hyponatremia group. ORs (95% confidence interval [CI]) include the following: prior hyponatremia, 0.927 (0.86, 1.00); recent hyponatremia, 2.018 (1.76, 2.32); persistent hyponatremia, 6.254 (3.27, 11.96).
