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Table 1 Example of effect on direct stanardisation of missing casemix combinations

From: Direct risk standardisation: a new method for comparing casemix adjusted event rates using complex models

  Age specific death rate per 100 admissions Directly standardised rates
  Children Adults Elderly  
Hospital 1 20 10 20 (0.25×20) + (0.5×10) + (0.25×20) = 15
Hospital 2   12 24 (0.5×12) + (0.25×24) = 12