According to the results of Mary Ainsworth's studies, about what percent of children raised in the United States experience insecure attachment relationships with their caregivers?

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Using the strange-situation test, Ainsworth found two basic types of attachment. Between 60 and 70% of U.S. middle-class babies displayed the first type of attachment, which is called secure attachment, where a strong emotional bond between a child and a caregiver develops because of responsive caregiving. The remaining babies-about 30 to 40%-displayed insecure attachment, which results from inconsistent or unresponsive caregiving.

According to the Results of Mary Ainsworth's Studies, About What