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and the other was of Puerto Rican working-class families. They found several differences. Among those were:
* Parents of middle class children were more likely to report behavior problems before the age of nine and the children had sleep problems. This may be because children start preschool between the ages of three and four. Puerto Rican children under the age of five showed rare signs of sleep problems, however, sleep problems became more common at the age of six.
* Middle-class parents also placed great stress on the child's early

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