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Colorado Center for Reproductive Medicine

2008 Statistics

Type of Cycle Age of Woman
Fresh Embryos from Non-donor Eggs <35 35-37 38-40 41-42
Number of cycles 260 182 185 76
Percentage of cycles resulting in pregnancies c 72.3 61.0 58.9 38.2
Percentage of cycles resulting in live births b,c 66.5 52.2 45.9 27.6
(Reliability Range) (60.8-72.3) (44.9-59.5) (38.8-53.1) (17.6-37.7)
Percentage of retrievals resulting in live births b,c 67.6 55.2 50.3 30.4
Percentage of transfers resulting in live births b,c 69.5 56.9 51.2 30.9
Percentage of transfers resulting in singleton live births 
41.4 38.3 34.3 25.0
Percentage of cancellations c 1.5 5.5 8.6 9.2
Implantation rate 43.4 35.8 23.3 16.2
Average number of embryos transferred 2.3 2.6 3.0 3.9
Percentages of live births with twins c 43.6 32.4 31.2 10.3
Percentage of live births with triplets or more c 4.8 4.5 8.3 6.9
Percentage of live births having multiple infants 40.5 32.6 32.9 19.0

Frozen Embryos from Non-donor Eggs

Age of Woman
<35 35-37 38-40 41-42
Number of transfers 115 96 89 38
Percentage of cycles resulting in live births b,c 55.7 52.1 41.6 34.2
Average number of embryos transferred 2.4 2.5 2.2 2.4

Donor Eggs

All Ages Combinede
Fresh Embryos Frozen Embryos
Number of transfers 146 53
Percentage of cycles resulting in live births b,c 78.8 60.4
Average number of embryos transferred 2.0 2.6

a) Reflects patient and treatment characteristics of ART cycles performed in 2008 using fresh, non-donor eggs or embryos
b) Pregnancies resulting in one or more children born alive (i.e., a multiple-infant birth is counted as one live birth).
c) When fewer than 20 cycles using fresh, non-donor eggs or embryos are reported in any one category, live birth rates are shown as fractions, and reliability ranges are not given. Calculation of percentage based on a fraction may be misleading and is not encouraged.
d) All ages (including age >42) are reported together because previous data show that patient age does not materially affect success with donor eggs.
e) For patients older than 42 undergoing ART cycles using fresh, non-donor eggs or embryos, clinic-specific outcome rates are unreliable. Patients are urged to review national outcomes for these age groups.

The above information was submitted to SART (Society for Reproductive Technology) in December, 2009 for inclusion in its national report on 2008 IVF statistics. This information will be published by SART in January 2010 and will be posted on the Centers for Disease Control and Prevention (CDC) website in late 2010.

Research cycles are included in SART data, not in CDC data, thus you will notice a difference in the SART and CDC data reports.

Reporting Success Rates

Through our continuous refinements in clinical and laboratory techniques, and with the application of scientific advancements, the Colorado Center for Reproductive Medicine continually achieves high pregnancy rates resulting in a live-born infant. A comparison of clinic success rates may not be meaningful because patient medical characteristics and treatment approaches may vary from clinic to clinic.

ART clinics in the U.S. are required by law to report outcomes to the Centers for Disease Control and Prevention (CDC). Most U.S. fertility programs follow the guidelines of the Society for Assisted Reproductive Technology (SART) in reporting success rates. Each year, SART and the CDC collect, compile, and publish clinic-specific data. Results are organized by state and procedure. The data also includes information on pregnancy outcomes, such as the rate of miscarriage, twins, and other multiple births.