Fig. 1

Δ progesterone (P) correlates with clinical pregnancy rate (CPR). The most predictive range for success: ΔP between 0.7–0.85 (P = 0.005; 95% CI 0.635–3.636). Δ P trends towards correlation with live birth rate (LBR). Association not significant, p = 0.063 95% CI -0.053-2.014. (*p < 0.05, **p < 0.005)