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Table 1 Results of matching of cases to control patients using four major criteria

From: Thrombocytopenia in critically ill surgical patients: a case-control study evaluating attributable mortality and transfusion requirements

 

Proportion of cases matched to control patients

Criterion

n/n

%

Same primary diagnosis

35/36

97

Same duration of stay in ICU (± 5 days)

31/36

86

Same APACHE II score (± 5)

29/36

81

Same age (± 5 years)

27/36

75

  1. APACHE, Acute Physiology and Chronic Health Evaluation; ICA,intensive care unit.