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. Author manuscript; available in PMC: 2017 Feb 1.
Published in final edited form as: Crit Care Med. 2016 Feb;44(2):319–327. doi: 10.1097/CCM.0000000000001392

Table 3.

Measure of Model Performance: Development, Internal Validation, and External Validation

Model N Percent of
Population		 Hosmer-
Lemeshow GOF
statisticsc
X2, df, p		 Area Under
the Receiver
Operator
Curve (C)
Development 65,069 60% 8.72, 8, 0.37 0.801
Validation 43,379 40% 6.76, 8, 0.56 0.765
Combined 108,448 100% 7.09, 8, 0.53 0.772
External Validation
  Martin Cohort 139,094 100% 6.71, 8, 0.57 0.803
  Angus Cohort 523,645 100% 5.14, 8, 0.74 0.838
Sepsis severity score 108,448 100% 14.4, 8, 0.07 0.709
c

GOF = goodness of fit; was performed on a random sample of 1000 observations, p>.05 indicates a good fit of the model to the data