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Mean (± SD) changes in Na during the study period.
SD = standard deviation, Na = serum sodium level.
a0 hours vs. 4 hours, P < 0.001; b4 hours vs. 8 hours, P < 0.001; c8 hours vs. 24 hours, P < 0.05; d24 hours vs. 4 days, P < 0.05; e11 days vs. 18 days, P < 0.001.
