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Table 4 Risk of Bias

From: A meta-analysis of the efficacy of allopurinol in reducing the incidence of myocardial infarction following coronary artery bypass grafting

Study Random Sequence Generation Allocation Concealment Blinding of participants and personnel Blinding of outcome assessments Incomplete outcome data Selective reporting Other Bias
Emerit et al. (1988) U U U U U H U
Rashid et al. (1991) L U U U L U U
Coghlan et al. (1994) L L L L L H H
Taggart et al. (1994) L U U U L U U
Castelli et al. (1995) U U U U L H H
Gimpel et al. (1995) U U U U L U U
  1. U unclear, L low, H high