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. 2017 Nov 21;7:15883. doi: 10.1038/s41598-017-16238-z

Table 3.

Univariate Cox proportional hazards analyses for 28-day all-cause mortality per 1 mEq/L increase of chloride concentration in hypochloremic group.

Variables (n = 297) HR (95% CI) p-value
Delta chloride for 24 hours (ΔCl24h) 0.914 (0.866–0.966) 0.001
Delta chloride for 48 hours (ΔCl48h) 0.936 (0.888–0.987) 0.014
Delta chloride for 72 hours (ΔCl72h) 0.961 (0.910–1.014) 0.258

Abbreviations; HR, hazard ratio; CI, confidence interval. Definitions; The 24 hour delta chloride concentration (ΔCl24h) (mEq/L) was calculated by the following formula: [Cl24h] − [Clat baseline], where Cl24h is the chloride concentration at 24 hour, and Clat baseline is the baseline chloride concentration. The 48 hour delta chloride concentration (ΔCl48h) (mEq/L) was calculated by the following formula: [Cl48h] − [Clat baseline], where Cl48h is the chloride concentration at 48 hour, and Clat baseline is the baseline chloride concentration. The 72 hour delta chloride concentration (ΔCl72h) (mEq/L) was calculated by the following formula: [Cl72h] − [Clat baseline], where Cl72h is the chloride concentration at 72 hour, and Clat baseline is the baseline chloride concentration.