हारियारि पछंथाननिफ्राइ सिगां खिदिया जोथोननि खुदिया देहा आरो सुबुङारि जौगानाय(NICHD) बिजिरनायनि बिथंनि सायाव, फ्राइयै 1,300 खुदियानि मोनसे लावथायारि बिजिरनाय।
Based on data from the National Institute of Child Health and Human Development (NICHD) Study of Early Child Care, a longitudinal study of approximately 1,300 children.