Our report on Sweden's national daycare system is cited in this summary of the latest research.
"Indeed, if non-parental child care better prepared kids for school, then countries like Sweden, which has had universal daycare since 1978, should be top performers. Yet that country’s PISA scores for 15-year-olds in mathematics, science and reading have dropped from above the OECD average in 2000 and 2003, to well below average in 2012, according to a study published by the Institute for Marriage and Family Canada. Meanwhile, mental health among Swedish 15-year-olds has declined faster from 1986 to 2002 than in eleven comparable European countries."
Read the full article here.