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Table 3 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 = 1812
Multivariable, all variables below
n = 1812
Multivariable, including SOFA-score
n = 1812
  Odds ratio 95% CI p-value Odds ratio 95% CI p-value Odds ratio 95% CI p-value
Type of transfer          
 Repatriation Reference    Reference    Reference   
 Clinical transfer 1.37 1.02–1.84 .035 1.77 1.27–2.48 .001 1.52 1.01–2.12 .014
 Capacity transfer 2.21 1.66–2.97 < .001 1.71 1.22–2.39 .002 1.62 1.16–2.26 .005
Variables adjusted for          
 Age (per year) 1.04 1.04–1.05 < .001 1.04 1.03–1.05  < .001 1.04 1.03–1.05 < .001
Gender          
 Female Reference    Reference    Reference   
 Male 1.31 1.03–1.67 .027 1.19 0.92–1.55 .190 1.19 0.91–1.56 .200
SAPS3 score          
 Box 1 (per point)a 1.06 1.04–1.09 < .001 1.05 1.02–1.07 .001 1.04 1.01–1.07 .006
 Box 2 (per point) 1.04 1.02–1.06 < .001 1.04 1.02–1.07 .002 1.03 1.00–1.06 .032
 Box 3 (per point) 1.05 1.04–1.06 < .001 1.04 1.03–1.06  < .001 1.03 1.02–1.04 < .001
Time and day of discharge          
 Daytime Reference    Reference    Reference   
 Night-time 1.40 1.00–1.96 .050 1.19 0.82–1.73 .361 1.13 0.78–1.65 .515
 Weekday Reference    Reference    Reference   
 Weekend 0.98 0.74–1.31 .913 0.93 0.68–1.26 .632 0.94 0.68–1.28 .682
 ICU length of stay (per hour) 1.00 1.00–1.00 .519 1.00 1.00–1.00 .992 1.00 1.00–1.00 .469
Principal disease groupb          
 Central nervous system injury Reference    Reference    Reference   
 COPDc 0.76 0.22–2.70 .178 0.68 0.18–2.52 .566 0.65 0.17–2.47 .527
 Cardiac arrest 2.41 1.44–4.04 < .001 1.08 0.57–2.03 .817 0.97 0.51–1.83 .923
 Acute lung injury 1.27 0.89–1.82 < .001 0.79 0.52–1.21 .281 0.71 0.46–1.09 .116
 Sepsis 1.80 1.16–1.55 .017 0.92 0.56–1.50 .735 0.71 0.43–1.17 .174
 Multi-trauma 0.41 0.24–2.77 < .001 0.59 0.28–1.24 .167 0.59 0.28–1.23 .160
 Other diagnoses 0.79 0.21–1.12 .186 0.71 0.48–1.05 .087 0.67 0.45–1.00 .050
SOFA-score on discharge          
 Total score (per point) 1.20 1.17–1.24 < .001   Not included   1.15 1.11–1.19 < .001
  1. 1812 patients with complete SOFA-score on day of transfer
  2. a Age deducted from score (see Methods)
  3. bSee Additional file 1: Table S1 for details of groups
  4. cChronic obstructive pulmonary disease