2.2 | Study selection criteria
The inclusion criteria for studies were as follows: (1) Assessed the accuracy of RAC for determining the status of H. pylori infection; (2) Used a rapid urease test, serum H. pylori antibody, and histological examination to define the reference standard for H. pylori infection; and (3) provided sufficient information (true and false positives and negatives) to construct the 2×2 contingency table.
The exclusion criteria were as follows: 1) reviews, letters, and case reports; 2) studies with insufficient data to construct the 2×2 table; and (3) studies not written in English.