Community health centers in Ethiopia face challenges in measuring clinical outcomes due to variability across different settings. A systematic literature review was conducted using multiple databases, including PubMed and Google Scholar. Studies were screened based on predefined inclusion criteria and analysed using a Bayesian hierarchical model to estimate variability and uncertainty in outcomes across settings. The analysis revealed significant heterogeneity in clinical performance measures between health centers, with some showing substantial improvement over time (e.g., a 20% increase in the proportion of patients receiving appropriate treatment). Bayesian hierarchical models provide robust tools for understanding and improving clinical outcomes in Ethiopian community health systems. Further research should focus on validating these models across diverse settings and exploring their potential impact on resource allocation and service delivery improvements. Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.