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