Risks of spontaneously and IVF-conceived singleton and twin pregnancies differ, requiring reassessment of statistical premises favoring elective single embryo transfer (eSET).

All other studies, indeed, did demonstrate statistically highly significant differences between IVF-associated and spontaneously conceived gestations; with IVF-singletons uniformly doing much poorer than spontaneously conceived singletons, and IVF-conceived twins doing much better than spontaneously conceived twins (Table 1 ).

also in 132,142 other papers