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A total of 16.188 results of Assisted Reproduction procedures, started in the year 2000 by 98 centres belonging to the RED were reported. As in the previous years, some longitudinal analysis of the procedures performed between 1990 and 2000 were included.
In 2000, the majority of the participant centres reported techniques of Micromanipulation (90.8%) and Cryopreservation (82.7%). In comparison to IVF, GIFT and others, the Micromanipulation continues being the most used technique, representing 70.9% of the aspirations.
The age distribution of the women treated in the last 3 years did not show significant variations. In 2000, the women aged < 35 represented 52.2% of the IVF and ICSI procedures, while women aged 35 – 39 and = 40 represented 37.7% and 14.1%, respectively.
The implantation rate in IVF shows significant difference only when compared to women aged <35 and =40 (p=0.04), while in ICSI these differences are significant in women aged < 35 in comparison to women aged between 35 – 39 and =40 (p<0.0001), and in women aged 35 – 39 versus = 40 (p<0.0001).
Although the light reduction in the pregnancy rate (31.5% in 1999, 27.7% in 2000) and in the implantation rate (12.9% in 1999 and 27.7% in 2000) in IVF and ICSI, the was an increase in the multiple gestation rate (28.5% in 1999 versus 30.2% in 2000). This increase of the proportion of the multiple gestation suggests these levels of the total population do not reflect in the efficiency of the women who got pregnant.
For this year, the media of the number of transferred embryos in women aged < 35 is 3.2, as for IVF as for ICSI, while in women aged 35 – 39 this number decreases to 3.2 in IVF and 2.9 in ICSI. In a general way, there was not an increase in the media of transferred embryos (3.2 embryos).
The pregnancy rate by transfer and the birth rate with > 1 liveborn, by aspiration, was 27.7% and 19.2% in IVF; 27.1% and 17.6% in ICSI. The 8.958 IVF and ICSI transfer generated 2.622 liveborn (1314 unique, 956 twins, 324 triplets and 28 quadruplets).