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Table 5 Exploratory analyses for model performance of Models 1 and 3 in different countries for 60-day hospital mortality using the whole dataset

From: Risk factors for and prediction of mortality in critically ill medical–surgical patients receiving heparin thromboprophylaxis

Model performance Goodness-of-fit C index SMR (95 % CI)
p valuea AIC
Model 1b
 Canada (n = 2456) 0.41 7639 0.61 0.981 (0.942–1.021)
 Australia (n = 768) 0.11 1418 0.62 0.965 (0.897–1.037)
 USA and UK (n = 109) 0.64 130 0.68 0.982 (0.804–1.186)
 Saudi Arabia and Brazil (n = 413) 0.77 1713 0.55 1.155 (1.054–1.263)
Model 3c
 Canada (n = 2456) 0.88 7489 0.62 0.996 (0.956–1.037)
 Australia (n = 768) 0.80 1349 0.63 0.968 (0.898–1.043)
 USA and UK (n = 109) 0.41 125 0.71 0.981 (0.801–1.190)
 Saudi Arabia and Brazil (n = 413) 0.25 1660 0.63 1.099 (0.943–1.311)
  1. AIC Akaike information criterion, SMR standardized mortality ratio
  2. aBased on Groennesby and Borgan test
  3. bModel 1 included APACHE II score only
  4. cModel 3 consisted of BMI, medical admission, inotropes or vasopressors, acetylsalicylic acid or clopidogrel, APACHE II score and the interaction between BMI and APACHE II score