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Table 2 Association between covariates and 30-day mortality

From: Intensive care unit to unit capacity transfers are associated with increased mortality: an observational cohort study on patient transfers in the Swedish Intensive Care Register

  Single explanatory variable
n = 11,176
Multivariable, all variables below included in analysis. n = 11,176
  Odds ratio 95% CI p-value Odds ratio 95% CI p-value
Type of transfer       
 Repatriation Reference    Reference   
 Clinical transfer 0.88 0.78–1.00 .058 1.17 1.02–1.36 .029
 Capacity transfer 1.72 1.48–2.00 < .001 1.25 1.06–1.49 .009
Variables adjusted for       
 Age (per year) 1.04 1.04–1.05 < .001 1.04 1.04–1.05 < .001
Gender       
 Female Reference    Reference   
 Male 1.12 1.01–1.24 .035 0.97 0.87–1.09 .627
SAPS3 score       
 Box 1 (per point)a 1.09 1.08–1.10 < .001 1.06 1.05–1.07 < .001
 Box 2 (per point) 1.05 1.04–1.06 < .001 1.03 1.02–1.04 < .001
 Box 3 (per point) 1.07 1.06–1.07 < .001 1.06 1.06–1.07 < .001
Time and day of discharge       
 Daytime Reference    Reference   
 Night-time 1.21 1.06–1.38 .004 1.20 1.04–1.40 .014
 Weekday Reference    Reference   
 Weekend 0.92 0.82–1.04 .197 0.98 0.86–1.11 .730
 ICU length of stay (per hour) 1.00 1.00–1.00 .002 1.00 1.00–1.00 .051
Principal disease groupb       
Central nervous system injury Reference    Reference   
 COPDc 1.42 0.85–2.38 .178 1.09 0.65–1.85 .727
 Cardiac arrest 2.77 2.18–3.51 < .001 1.56 1.20–2.01 .001
 Acute lung injury 1.43 1.21–1.69 < .001 1.15 0.98–1.35 .072
 Sepsis 1.27 1.04–1.55 .017 0.90 0.74–1.09 .292
 Multi-trauma 0.34 0.24–0.47 < .001 0.72 0.51–1.02 .066
 Other diagnoses 0.71 0.62–0.82 < .001 0.70 0.60–0.83 < .001
  1. aAge deducted from score (see Methods)
  2. bSee Additional file 1: Table S1 for details of groups
  3. cChronic obstructive pulmonary disease