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Table 4 Logistic regression models on the subgroup admitted after elective cardiac surgery

From: Impact of chloride and strong ion difference on ICU and hospital mortality in a mixed intensive care population

  Outcome: 30-day mortalitya (n = 2350) Outcome: hospital mortalityb (n = 2156)
n % outcome (%) Odds ratio (95 % CI) versus normochloremia p value n % outcome (%) Odds ratio (95 % CI) versus normochloremia p value
Chloride category
 Normochloremia 287 5.6    246 13.4   
 Hypochloremia 21 23.8 3.49 (0.62–19.62) 0.16 15 40.0 1.45 (0.30–7.18) 0.64
 Moderate hyperchloremia 596 3.0 0.63 (0.26–1.54) 0.31 550 5.1 0.43 (0.22–0.83) 0.01
 Severe hyperchloremia 1446 2.7 0.57 (0.22–1.44) 0.23 1345 4.5 0.37 (0.18–0.73) 0.004
  n % outcome (%) Odds ratio (95 % CI) versus mean SID p value n % outcome (%) Odds ratio (95 % CI) versus mean SID p value
SIDa category
 Intermediate SIDa 941 2.6    873 5.2   
 Low SIDa 1110 2.0 1.46 (0.68–3.11) 0.34 1015 4.1 1.13 (0.63–2.03) 0.68
 High SIDa 229 10.7 0.85 (0.39–1.83) 0.67 268 14.9 0.71 (0.38–1.31) 0.27
  Area under ROC 88.3 %    Area under ROC 83.9 %
Maximal VIF 3.53   Maximal VIF 3.58
Tolerance 0.66   Tolerance 0.66
  1. SIDa apparent strong ion difference (excl. lactate), ROC Receiver under Operating Characteristics Curve, VIF variance inflation factor
  2. aConfounders adjusted for in the model: sodium (high vs. normal, low vs. normal*), SAPS-3, RIFLEcrea, lactate, heart failure*, COPD*, pCO2* (low, normal, high), albumin*, SIG, potentiometry type (*p > 0.05). RIFLEurine omitted because of collinearity
  3. bConfounders adjusted for in the model: sodium (high vs. normal, low vs. normal*), SAPS-3, RIFLEcrea, lactate, heart failure*, COPD, pCO2* (low, normal, high), albumin*, SIG, potentiometry type (*p > 0.05). RIFLEurine omitted because of collinearity