Fig. 3.

— Comparison of perinatal data of 9353 IVF/ICSI, 4812 non-IVF OS and 24876 spontaneously conceived twin births. Logistic regression analysis was performed including mode of conception, female age, foetal sex, parity and year of delivery. (OR = odds ratio with 95 % confidence intervals, OS = ovarian stimulation, NC = natural conception, IUD = intrauterine death, END = early neonatal death, PNM = perinatal mortality, NIC transfer = transfer to the neonatal intensive care unit, IC bleeding = intracranial bleeding). * p < 0.05 = significant