meta-analysis for three early intervention programs: evidence from the US

Recently, it has become more evident in economics that early intervention is more effective than late intervention in a child's well-being. There have been many studies on such interventions in the past. However, there is a need for comparatively evaluating such interventions with others. My research will focus on the early intervention programs that have achieved a high level of economic benefits. From data available on randomized control trials, A meta-analysis of early intervention programs - Abecedarian, Perry Preschool, and Chicago Child-Parent Centers (CPC) programs - with particular attention to benefit-cost analysis studies will be the main object of this research.