2014
From the abstract: Results showed that higher quality care predicted more effective executive functioing at 48 months, irrespective of quantity or type. Attending greater hours of care per week was also related to EF.
Citation
Berry, D., Blair, C., Ursache, A., Willoughby, M. T., Granger, D. A., & the Family Life Project Key Investigators. (2014). Early childcare, executive functioning, and the moderating role of early stress physiology. Developmental Psychology, 50, 1250-1261.
DOI
10.1037/a0034700