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Table 2 ICU patient characteristics and outcomes

From: Characteristics and outcomes of patients admitted to adult intensive care units in Hong Kong: a population retrospective cohort study from 2008 to 2018

  2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
Age (years) 63 (50–75) 62 (50–75) 63 (50–75) 62 (50–75) 62 (50–75) 62 (51–75) 63 (51–74) 63 (52–75) 63 (52–74) 64 (52–74) 63 (52–73)
Age ≥ 80 years (%) 14.3 13.3 14.5 14.7 14.2 14.5 14.1 15.3 15 15 13.2
Male gender (%) 61.8 61.8 61.2 61.4 60.5 61.4 62.0 61.9 61.7 61.9 60.4
Comorbidity (%) 13.3 14.5 13.5 12.4 15.9 13.7 15.1 15.7 15.6 16.1 17.4
Admission type            
Elective surgery (%) 23.0 21.4 20.3 21.9 24.3 24.5 24.8 23.1 22.7 21.6 22.0
Emergency surgery (%) 21.2 21.3 22.9 24.4 21.8 21.5 22.3 21.7 20.5 20.9 20.9
Medical (%) 55.8 57.3 56.9 53.7 53.9 54.0 52.9 55.2 56.8 57.5 57.1
APACHE IV APS 51 (33–76) 51 (33–76) 50 (34–74) 49 (32–73) 49 (32–73) 49 (32–75) 49 (32–75) 49 (32–74) 49 (32–74) 49 (32–72) 48 (32–71)
APACHE IV 64 (43–89) 63 (43–89) 63 (43–87) 61 (42–86) 62 (42–87) 61 (42–88) 61 (42–87) 62 (42–88) 62 (43–88) 61 (43–85) 61 (43–84)
Mechanical ventilation (%) 55.1 56.2 56.5 55.1 53.9 54.8 53.4 54.0 51.8 51.6 53.3
Vasopressor (%) 12.1 12.1 11.7 12.3 13.1 14.7 16.4 24.0 23.4 27.1 30.9
Renal replacement therapy (%) 9.6 11.6 13.2 12.1 11.5 11.8 12.8 13.1 13.1 14.1 13.2
ICU LOS (days) 2.0 (1–4.4) 1.9 (1.0–4.1) 2.0 (1.0–4.5) 1.9 (1.0–4.2) 2.0 (1.0–4.5) 2.0 (1.0–4.6) 2.0 (1.0–4.6) 2.0 (1.0–4.7) 2.0 (1.0–4.5) 2.0 (1.0–4.4) 2.0 (1.0–4.2)
Predicted ICU LOS (days) 4.9 (3.1–6.6) 4.9 (3.2–6.6) 4.9 (3.2–6.7) 4.8 (3.2–6.6) 4.7 (3.1–6.6) 4.7 (3.1–6.6) 4.7 (3.0–6.6) 4.7 (3.1–6.7) 4.7 (3.0–6.7) 4.7 (3.0–6.7) 4.7 (3.0–6.6)
Hospital LOS (days) 12.2 (6.8–24.4) 12.1 (6.5–24.1) 11.9 (6.5–24.0) 12.1 (6.7–24.1) 12.2 (6.8–24.2) 12.4 (6.8–24.1) 13.0 (7.0–25.6) 12.5 (6.8–25.8) 12.8 (6.9–25.8) 13.2 (6.9–27.0) 13.0 (7.1–26.2)
ICU mortality (%) 12.5 12.1 12.0 11.0 10.8 10.7 9.8 9.7 9.4 9.3 8.5
Hospital mortality (%) 19.7 19.5 18.8 16.9 17.0 17.6 16.7 16.7 15.7 15.8 14.3
APACHE IV predicted mortality (%) 24.3 24.5 23.6 22.7 23.4 23.6 23.2 23.6 23.5 22.5 21.9
SMR 0.81 0.80 0.80 0.74 0.73 0.74 0.72 0.71 0.67 0.70 0.65
Readmission rate (%) 5.69 5.76 5.48 5.14 4.65 4.87 4.92 5.54 4.96 5.45 5.69
  1. All values in median (IQR) unless otherwise specified. Comorbidity is calculated by having any of the chronic illnesses diagnosis in APACHE IV score. APACHE Acute Physiology and Chronic Health Evaluation, APS Acute Physiology Score, LOS length of stay, SMR standardised mortality ratio