How do the success rates of IVF compare in the United States? Age, clinic locations and statistical caliber
Explain pregnancy rates, live birth rates, and different statistical denominators, using labeled calculation examples to show why two success rate numbers are not directly comparable.
First determine which success rate is compared
Comparison of IVF success rates in the United States must start from the same reporting year, the same reporting subject and the same patient grouping. HRC is a multi-site brand, and RFC also has multiple locations; similar brand names or the same doctors are not enough to prove that the reports cover the same batch of treatments. First map the clinic name, city and address on the report to the location where you plan to see a doctor, and then read the percentage.
| Statistical method | What is included | What is easy to miss when comparing |
|---|---|---|
| Live birth rate per transfer | Live birth outcomes after entering the embryo transfer stage. | Patients who did not obtain a transplantable embryo and did not proceed to transfer are not included in this denominator. |
| Cumulative live birth rate for each intended egg retrieval | Statistics will be made from the starting point of the planned egg retrieval, and included in the relevant subsequent transfer according to the report regulations. | The period of observation, which transfers are included, and whether follow-up is complete must be consistent. |
| Pregnancy rate | Pregnancy is counted as reported; may be biochemical or clinical. | Pregnancy does not equal live birth and cannot be ranked alongside live birth rates. |
How to check the public reports of HRC and RFC
| Steps | HRC | RFC |
|---|---|---|
| Identify report subject | Using the English name, city and address of the actual clinic locations to query, different location reports cannot be directly synthesized into a total brand score. | Check with Reproductive Fertility Center and actual location to exclude other clinics with the same abbreviation. |
| Select the crowd | Record age group, autologous or donor eggs, fresh or frozen, and report classification of embryo testing. | Use the same grouping as for HRC to avoid comparing tested vs. untested embryos. |
| Select indicators | Keep the complete indicator name, denominator, number of cases and reporting year. | Using the same indicator and year, the sample size is obviously different and the number of cases is displayed at the same time. |
CDC's ART Success Rates is the public data portal for assisted reproduction in the United States; SART's Clinic Lookup can be used to find their member reports. Not all locations necessarily have the same coverage in both systems, and failure to find a location cannot be directly explained as poor efficacy. Reports often have a publication lag, and the latest publication year does not equal the current treatment year.
Different percentages may occur for the same 20 live births
The following only demonstrates the denominator, not the real data of HRC or RFC: Assume 80 planned egg retrieval cycles, 50 transfers and 20 live births during the specified observation period. Calculated based on transfer, it is 20÷50=40%; in this simplified example, calculated based on the original 80 planned egg retrieval cycles, it is 25%. The two describe different stages, and 40% cannot be used to claim to be superior to another clinic's 25% based on egg retrieval statistics. In reality, one cycle may correspond to multiple migrations, and the specific cumulative definition of the report should be followed.
Comparative conclusions that can be drawn at present
At present, the public information is not enough to determine the success rate of HRC and RFC according to the same year, the same age group, the same egg source and the same indicator. What can be directly compared now is whether the report corresponds to the target clinic locations, whether the data grouping is complete, and whether the doctor can interpret the results related to your previous treatment.
If egg freezing is the main consideration, the age of egg freezing, the number of mature eggs and future thawing use should be additionally discussed; if existing embryos are only transferred, attention should be paid to the corresponding transfer population. Overall IVF live birth rates do not directly answer these two types of questions.