School should begin at age 3 years for American children.
Zigler
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Department of Psychology, Yale University, New Haven, Connecticut, USA.
D000124:Achievement; D002654:Child Care / Q000639:trends; D002675:Child, Preschool; D018479:Early Intervention, Educational / Q000639:trends*; D005260:Female; D005544:Forecasting; D006801:Humans; D007223:Infant; D008297:Male; D011203:Poverty / Q000639:trends*; D014481:United States