1. Evaluation of a preterm birth prevention program: preliminary report;Herron;Obstet Gynecol,1982
2. System for predicting spontaneous preterm birth;Creasy;Obstet Gynecol,1980
3. Prospective evaluation of a risk scoring system for predicting preterm delivery in black inner city women;Main;Obstet Gynecol,1987
4. Mueller-Heubach E, Reddick D, Barnett B, Bente R. Preterm birth prevention: evaluation of a prospective controlled randomized trial. Am J Obstet Gynecol (In press).
5. SPSS/PC+ for the IBM PC/XT/AT;Norusis;Chicago: SPSS Inc.,1986