Fig. 1From: The continuum of ovarian response leading to BIRTH, a real world study of ART in SpainEmbryos graded according to the “Criterios ASEBIR de Valoración Morfológica de Oocitos, Embriones Tempranos y Blastocistos Humanos”; A = top quality; B = good quality (not for elective single embryo transfer); C = impaired embryo quality; D = do not recommend to transfer (includes all multinucleated embryos); ND = not classified [10, 11]Back to article page