Key points are not available for this paper at this time.
Christine A. Bachrach, Susan Newcomer, Intended Pregnancies and Unintended Pregnancies: Distinct Categories or Opposite Ends of a Continuum?, Family Planning Perspectives, Vol. 31, No. 5 (Sep. - Oct., 1999), pp. 251-252
Bachrach et al. (Wed,) studied this question.