Fig. 2.

a Restricted cubic spline curve and 95 % confidence levels between antral follicle count and log odds of live birth; b Restricted cubic spline curve and 95 % confidence levels between the total number of good-quality embryos and log odds of live birth; c Restricted cubic spline curve and 95 % confidence levels between the total number of embryos and log odds of live birth; d Restricted cubic spline curve and 95 % confidence levels between the number of oocytes retrieved and log odds of live birth