Premature luteinization during gonadotropin-releasing hormone antagonist cycles and its relationship with in vitro fertilization outcome  Ernesto Bosch, M.D., Iván Valencia, M.D., Ernesto Escudero, M.D., Juana Crespo, M.D., Carlos Simón, M.D., José Remohí, M.D., Antonio Pellicer, M.D.  Fertility and Sterility  Volume 80, Issue 6, Pages 1444-1449 (December 2003) DOI: 10.1016/j.fertnstert.2003.07.002

FIGURE 1 Area under the receiver-operating characteristic (ROC) curve for serum hormone measurements. (A) Serum E2 level. The area under the ROC curve was 0.534 (95% CI, 0.407 to 0.660). (B) Serum LH level. The area under the ROC curve was 0.581 (95% CI, 0.453 to 0.709). (C) Serum P level. The area under the ROC curve was 0.672 (95% CI, 0.555 to 0.789). The difference between these areas and the reference line (area 0.5) was statistically significant only for serum P level (P=.008). Bosch. Serum progesterone and IVF outcome. Fertil Steril 2003. Fertility and Sterility 2003 80, 1444-1449DOI: (10.1016/j.fertnstert.2003.07.002)