2021 Yes https://www.mdpi.com/1660-4601/18/2/535 Bikomeye, Jean C North America Europe Observational Students Elementary (K-5) Middle/Jr High (6-8) Stress/Anxiety Green space Nature Schoolyard greening Physical activity Socioemotional health Mental health Child health Experimental design Pre-post study design Health equity Examination of the eligible studies revealed a general consensus on the positive impact of schoolyard greening on both physical activity and socioemotional health outcomes for students, suggesting that schoolyard greening is a viable intervention in reducing the health equity gaps and improving children’s health regardless of their racial or ethnic backgrounds or residential neighborhood socioeconomic status.