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Daycare Effects on Preschool <br /> 6 <br /> Insert Table 1 about here <br /> Procedure <br /> The intellectual levels of the children were assessed semi-annually between the <br /> ages of 6 and 54 months of age. Children were administered the Bayley Scales of Infant <br /> Development (Bayley, 1969) at 6, 12, and 18 months, the Stanford-Binet Intelligence <br /> Scale (Term an & Merrill, 1973) at 24, 36, and 48 months, and the McCarthy Scales of <br /> Children's Ability (McCarthy, 1972) at42 and 54 months. Each child was given the <br /> appropriate IQ test at each age by a trained female experimenter. <br /> Children's daycare history was collected annually in an interview with their <br /> mothers or guardians. The number of months that each child attended a corn m unity Title <br /> X X daycare center between birth and 54 months was recorded. Analysis groups were <br /> created by assigning children to one of three "daycare groups" based the "intensity" of <br /> treatment, i.e., the type of daycare they had attended. It was decided that children who <br /> attended the university-based cognitively-oriented intervention daycare center received <br /> a more intense treatment than children than children attending corn m unity daycare <br /> centers. Similarly, it was determined that children who attended center-based <br /> corn m unity daycare centers for 11 months or less had been exposed to so little <br /> systematic daycare that it was functionally equivalent to no daycare. The three groups <br /> consisted of: <br />