Statistical methods in evaluating the outcome of infertility therapy**Supported in part by National Cancer Institute, National Institutes of Health Trainee Grant 2T32 CA 09001-04 (Department of Epidemiology, Harvard University School of Public Health)
Plasma progesterone, serum estriol and plasma HPL determinations during the last trimester to detect changes before spontaneous labor. Comparison of progesterone assay using RIA and CPB.