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Table 1 A 2x2 table to be extracted from each study for each binary outcome of interest

From: Protocol for a systematic review of the diagnostic and prognostic utility of tests currently available for the detection of aspirin resistance in patients with established cardiovascular or cerebrovascular disease

Test result Number of patients with an event Number of patients with no events
Test positive (‘Aspirin resistant’) TP FP
Test negative (‘Aspirin sensitive’) FN TN
  1. TP = true positives; FP = false positives; FN = false negatives; TN = true negatives.