Key points are not available for this paper at this time.
Everett Waters, Judith Wippman, L. Alan Sroufe, Attachment, Positive Affect, and Competence in the Peer Group: Two Studies in Construct Validation, Child Development, Vol. 50, No. 3 (Sep., 1979), pp. 821-829
Waters et al. (Sat,) studied this question.