Key points are not available for this paper at this time.
Leah Matas, Richard A. Arend, L. Alan Sroufe, Continuity of Adaptation in the Second Year: The Relationship between Quality of Attachment and Later Competence, Child Development, Vol. 49, No. 3 (Sep., 1978), pp. 547-556
Matas et al. (Fri,) studied this question.