Key points are not available for this paper at this time.
Kazuo Yamaguchi, Denise Kandel, Drug Use and Other Determinants of Premarital Pregnancy and Its Outcome: A Dynamic Analysis of Competing Life Events, Journal of Marriage and Family, Vol. 49, No. 2 (May, 1987), pp. 257-270
Yamaguchi et al. (Fri,) studied this question.