Key points are not available for this paper at this time.
Marsha Weinraub, Michael Lewis, The Determinants of Children's Responses to Separation, Monographs of the Society for Research in Child Development, Vol. 42, No. 4, The Determinants of Children's Responses to Separation (1977), pp. 1-78
Weinraub et al. (Sat,) studied this question.