A much-anticipated report from the largest and longest-running study of American child care has found that keeping a preschooler in a day care center for a year or more increased the likelihood that the child would become disruptive in class — and that the effect persisted through the sixth grade.

The effect was slight, and well within the normal range for healthy children, the researchers found. And as expected, parents’ guidance and their genes had by far the strongest influence on how children behaved.

Others experts were quick to question the results. The researchers could not randomly assign children to one kind of care or another; parents chose the kind of care that suited them. That meant there was no control group, so determining cause and effect was not possible. And some said that measures of day care quality left out important things.

The study did not take into account employee turnover, a reality in many day care centers that can have a negative effect on children, said Marci Young, deputy director of the Center for the Child Care Workforce, which represents day care workers. Most employees are “egregiously underpaid and have no benefits,” Ms. Young said, and when they leave for other work, “children experience this as a loss, and that does have an effect on them.”

...In 2001, the authors reported that children who spent most of their day in care not provided by a parent were more likely to be disruptive in kindergarten. But this effect soon vanished for all but those children who spent a significant amount of time in day care centers.

...The study was not designed to explain why time in day care could lead to more disruptive behavior later on. The authors and other experts argue that preschool peer groups probably influence children in different ways from one-on-one attention. In large groups of youngsters, disruption can be as contagious as silliness, studies have found, while children can be calmed by just the sight of their own mother.

“What the findings tell me is that we need to pay as much attention to children’s social and emotional development as we do to their cognitive, academic development, especially when they are together in groups,” said Ellen Galinsky, president of the Families and Work Institute, a nonprofit research group.

Labels: alarmist, daycare, journalism, kids

Labels: character, journalism, politics