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Table 3 Organizational characteristics of the ICUs and their association with risk-adjusted hospital mortality

From: The influence of volume and intensive care unit organization on hospital mortality in patients admitted with severe sepsis: a retrospective multicentre cohort study

ICU characteristic Descriptivea Odds ratio (95% confidence interval) P value
Number of admissions with severe sepsis per year 72.8 ± 44.0, 65 0.997 (0.995–1.000) 0.027
Total number of admissions per year 522.2 ± 255.0 (488) 1.000 (1.000–1.001) 0.759
Number of ICU beds 15.0 ± 9.8 (12) 0.997 (0.984–1.010) 0.676
Number of hospital beds 561.7 ± 357.6 (510) 1.000 (1.000–1.001) 0.586
Intensivist responsible for ICU treatment 96.4 (27) b b
Intensivist available on weekdays 7–18 hours 96.4 (27) b b
Intensivist available in evening and weekend 67.9 (19) 1.237 (0.878–1.741) 0.224
Number of intensivists per ICU bed 0.30 ± 0.12 (0.33) 1.164 (1.010–1.341)c 0.036
Number of nurses per ICU bedd 3.6 ± 1.01 (3.8) 0.956 (0.861–1.063) 0.406
Staffing    
   General physiciane 60.7 (17) 0.981 (0.741–1.298) 0.891
   Residents 96.4 (27) b b
Fellows in training for intensivist 21.4 (6) 1.014 (0.749–1.374) 0.927
MCU as a step-down facility 42.9 (12) 1.261 (0.990–1.608) 0.061
24-hour recovery in hospital 28.6 (8) 1.118 (0.878–1.425) 0.365
  1. aValues are expressed as mean ± standard deviation (median) for continuous variables and percentage (n) for dichotomous variables. bVariable not taken into account in regression analysis because of lack of variation. cOdds ratio per 0.1 increase in intensivist-to-bed ratio. dvalues based on 24 ICUs. eGeneral physician: physician working temporarily at the ICU, not in training for specialist. ICU, intensive care unit; MCU, medium care unit.