Methodological Evaluation of District Hospitals Systems in Nigeria: A Randomized Field Trial for Yield Improvement Assessment

District hospitals in Nigeria face challenges in delivering efficient healthcare services, leading to suboptimal outcomes. A systematic literature review was conducted using databases such as PubMed and Scopus. Studies were selected based on predefined criteria focusing on methods, success rates, and outcomes of interventions aimed at improving healthcare delivery. The analysis revealed that a significant proportion (35%) of studies used randomized field trials to measure yield improvement, indicating their effectiveness in assessing system performance. Randomized field trials are recommended as a robust method for evaluating district hospital systems and measuring yield improvement. These methods provide reliable data on intervention efficacy. Healthcare policymakers should consider adopting randomized field trials for future assessments of healthcare delivery systems to enhance service quality and patient outcomes. Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.