{ "background": "Community health centre programmes are central to primary healthcare delivery in Ethiopia, yet robust economic evaluations of their cost-effectiveness are limited. Systematic reviews of evidence from randomised field trials, which provide the highest quality data for such analyses, are lacking, creating a gap in evidence-informed policy.", "purpose and objectives": "This systematic review aims to critically appraise the methodological approaches used to assess cost-effectiveness in randomised field trials of community health centre interventions in Ethiopia. It seeks to evaluate the rigour of economic evaluation designs, the consistency of outcome measures, and the reporting standards employed.", "methodology": "A systematic search of multiple electronic databases was conducted following PRISMA guidelines. Included studies were randomised field trials incorporating a full economic evaluation of a community health centre programme. Data were extracted on study design, cost and outcome measurement, analytical methods, and reporting quality. A meta-analysis was not feasible due to methodological heterogeneity; a narrative synthesis was performed. The generalised linear model $g(E(Y)) = \\beta0 + \\beta1 X1 + ... + \\betap X_p$ was used as a benchmark to assess the sophistication of statistical modelling in the included studies.", "findings": "Of the 27 included trials, only a minority (approximately 33%) employed a payer perspective alongside a societal perspective for cost calculation. A key theme was the frequent omission of probabilistic sensitivity analysis, with only 7 studies reporting 95% confidence intervals around incremental cost-effectiveness ratios. The methodological rigour was highly variable, and standardised outcome measures for non-health benefits were conspicuously absent.", "conclusion": "The methodological quality of cost-effectiveness analyses within randomised trials is inconsistent, undermining the comparability and policy utility of the evidence. Many studies fail to adhere to established economic evaluation guidelines, particularly in handling uncertainty and adopting comprehensive analytical perspectives.", "recommendations": "Future trials must pre-specify and adhere to a reference case for economic evaluation, mandate probabilistic sensitivity analysis, and incorporate standardised tools for measuring broader social