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Table 1 Patient and hospital characteristics

From: Changes in hospital costs after introducing an intermediate care unit: a comparative observational study

  Pre-IMC period IMC period P value
  n = 329 n = 475  
Number of ICU beds 17 16  
Number of IMC beds - 6  
Gender, percentage of males 61.2% 59.6% 0.67a
Age, mean ± SD, years 57 ± 18.3 56 ± 18.0 0.20b
Age, 25%/median/75%, years 43/60/72 44/59/70  
Surgical patients, number (percentage) 175 (53.2%) 277 (60.6%) 0.04a
Diagnostic category, number (percentage)    <0.01a
   Neurosurgical 41 (12.5%) 141 (30.9%)  
   Respiratory 88 (26.7%) 87 (19%)  
   Gastrointestinal 18 (5.5%) 14 (3.1%)  
   Cardiovascular 105 (31.9%) 134 (29.3%)  
   Multitrauma 36 (10.9%) 41 (9%)  
   Sepsis 16 (4.9%) 20 (4.4%)  
   Metabolic/Renal 17 (5.2%) 16 (3.6%)  
   Haematological 2 (0.6%) 4 (0.9%)  
Length of stay in the ICU, mean ± SD, days 5.8 ± 9.2 7.0 ± 2.4 0.25b
Length of stay in the ICU, 25%/median/75%, days 1/3/6 1/2/8.5  
APACHE II score, mean ± SD (number) 19.5 ± 8.2 (230) 19.9 ± 7.6 (279) 0.44b
APACHE II score, 25%/median/75% 13/19/24 14/19/25  
TISS-28 score on 1st day, mean ± SD 28.9 ± 10.8 30.2 ± 11.0 0.16b
TISS-28 score on 1st day, 25%/median/75% 21/28/36 22/29/37  
TISS-28 ICU stay, mean ± SD 26.9 ± 9.3 28.6 ± 9.6 0.02b
TISS-28 ICU stay, 25%/median/75% 20/26/33 22/28/35  
Mortality in the ICU, number (percentage) 64 (19.5%) 115 (25.2%) 0.06a
Mortality after ICU, number (percentage) 13 (4.0%) 14 (3.1%) 0.77a
  1. aChi-square tests. bMann-Whitney tests. APACHE II, Acute Physiology and Chronic Health Evaluation II; ICU, intensive care unit; IMC, intermediate care unit; SD, standard deviation; TISS-28, Therapeutic Intervention Scoring System with a median value of 28.