15. Odds ratio for clinical pregnancy rates with various stimulation protocols 1.21 Recombinant vs urinary FSH 0.79 GnRH antagonists vs agonist 1.8 GnRH a vs HMG 1.47 Long vs ultrashort 1.27 Long vs short protocol 1.32 Long vs short and ultrashort 1.70 Urinary FSH vs HMG ODDS RATIO STIMULATION PROTOCOL