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Table 2 Means, standard deviations, and numbers of patients for hospital cost, also broken down for some relevant factors (n = 786)

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

Costs Pre-IMC period IMC period P value P value interaction
  Number Mean (SD) Number Mean (SD)   
Total hospital stay 329 12.961 (14.530) 457 16.513 (19.324) 0.01  
ICU stay 329 10.017 (13.317) 457 13.020 (17.659) 0.07  
IMC stay 0 - 143 2.612 (4.060) -  
General ward stay 236 4.105 (5.924) 304 4.065 (5.095) 0.83  
LOS in the ICU of <1 week 155 5.738 (5.028) 231 6.965 (5.922) 0.11  
LOS in the ICU of >1 week 174 19.396 (17.010) 226 26.272 (23.058) <0.001 0.13
LOS in ward of <1 week 177 9.734 (11.125) 240 13.533 (18.476) 0.01  
LOS in ward of >1 week 152 16.719 (14.045) 217 19.808 (19.743) 0.35 0.22
Readmissions to ICU 21 27.326 (18.558) 38 30.818 (5.627) 0.44  
Non-readmissions to ICU 308 12.130 (13.849) 419 17.499 (847) 0.02 0.99
Surgical patients 175 14.586 (14.162) 277 18.091 (18.483) 0.06  
Non-surgical patients 154 11.115 (14.766) 180 14.085 (20.365) 0.31 0.79
Deceased in hospital 77 14.444 (18.540) 129 18.292 (19.970) 0.10  
Non-deceased in hospital 252 12.509 (13.073) 328 15.813 (19.049) 0.06 0.47
TISS score on 1st day < median 165 9.770 (11.125) 220 10.608 (13.140) 0.62  
TISS score on 1st day > median 149 17.112 (17.138) 230 22.514 (22.450) 0.01 0.14
  1. The P value concerns the differences between pre-IMC and IMC periods. The P value interaction tests whether the differences of studied relevant factors change from the pre-IMC period to the IMC period. In both tests, 10log-transformed costs were analysed. ICU, intensive care unit; IMC, intermediate care unit; LOS, length of stay; SD, standard deviation; TISS, Therapeutic Intervention Scoring System.