Community health centres (CHCs) play a crucial role in South Africa's healthcare system, yet their effectiveness remains under scrutiny. A systematic literature review was conducted using multilevel regression models with robust standard errors to analyse yield data across different CHC settings in South Africa. Multilevel regression analysis revealed a significant positive correlation (β = 0.45, p < 0.001) between investment levels and patient satisfaction scores at CHCs, highlighting the importance of financial support for service improvements. This study underscores the methodological value of multilevel regression in evaluating yield improvement at CHCs, providing a robust framework for future research and policy development. Investigating additional factors influencing yield such as training programmes for healthcare staff could further enhance our understanding of effective intervention strategies. Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.