The graph on the front cover shows the effect of the numbers of oocytes retrieved on implantation rates in mild and conventional protocols. Predicted ongoing pregnancy rate per embryo transferred (implantation rate) are plotted according to the number of oocytes retrieved following mild or conventional ovarian stimulation for IVF (P = 0.045). Curves were fitted to the observed implantation rates using a flexible 4 knotted spline function. Blue = mild, Red = conventional. See Verberg et al., pp. 5-12.
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