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Background: Conflicting results have been reported on the association of C-reactive protein (CRP) level with adverse outcomes in patients with stable coronary artery disease (CAD). The objective of this meta-analysis was to evaluate the predictive value of baseline CRP level in stable CAD patients.Methods: Two reviewers independently searched PubMed and Embase databases from their inception to November 28, 2021 to identify studies assessing the value of baseline CRP level in predicting adverse outcomes in stable CAD patients. The endpoints of interest included cardiovascular mortality, all-cause mortality, or major adverse cardiovascular events (MACEs). The predictive value of CRP level was estimated by pooling the multivariable adjusted risk ratio with 95% confidence intervals (CI) compared the highest to the lowest CRP level.Results: Twenty-six studies involving of 22,602 patients with stable CAD satisfied the inclusion criteria. In a comparison of the highest with the lowest CRP level, the pooled multivariable adjusted risk ratio was 1.77 (95% CI 1.60-1.96) for MACEs, 1.64 (95% CI 1.13-2.33) for cardiovascular mortality, and 1.62 (95% CI 2.62-5.12) for all-cause mortality, respectively. Subgroup analyses indicated that the values of elevated CRP level in predicting MACEs were consistently observed in each subgroup.Conclusion: Elevated baseline CRP level was an independent predictor of MACEs, cardiovascular mortality, and all-cause mortality in patients with stable CAD. Baseline CRP level can provide important predictive information in stable CAD patients.Abbreviations: CAD = coronary artery disease, CI = confidence intervals, CRP = C-reactive protein, MACEs = major adverse cardiovascular events, RR = risk ratio.

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