Age Cohort Head Start Group Control Group Total Sample 3-year-olds 1,530 1,029 2,559 4-year-olds 1,253 855 2,108 Total 2,783 1,884 4,667
Sample Group Some Year 1 Head Start Participation No Year 1 Head Start Participation Total All Randomly Assigned (N=4,667): 3-Year-Old Cohort Head Start Group 85.1% 14.9% 100% Control Group 17.3% 82.7% 100% 4-Year-Old Cohort Head Start Group 79.8% 20.2% 100% Control Group 13.9% 86.1% 100%