9783642753725 | Reprint edition (Springer Verlag, December 13, 2011), cover price $149.00 | About this edition: The idea of placebo-controlled drug trials and the advent of test statistics during the first part of this century were the major milestones in the establishment of a convincing methodology for demonstrating the efficacy of treatments.

9781841841311 | CRC Pr I Llc, November 1, 2002, cover price $239.95

9780803952829 | Sage Pubns, September 15, 1993, cover price $139.00 | About this edition: The challenge of reaching teenagers before an unintended pregnancy occurs is particularly pertinent when considering unmarried teenagers from disadvantaged circumstances: while the incidence of teenage pregnancy increases, resources to assist adolescents in both child care and employment are lacking.

9780803952836 | Sage Pubns, September 10, 1993, cover price $69.00 | About this edition: The challenge of reaching teenagers before an unintended pregnancy occurs is particularly pertinent when considering unmarried teenagers from disadvantaged circumstances: while the incidence of teenage pregnancy increases, resources to assist adolescents in both child care and employment are lacking.