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| Variable | Europe, 2003* | United States, 2006 |
| Oocyte retrievals | 272,053 | 79,732 |
| Embryo transfers | 246,738 | 72,904 |
| Pregnancies | ||
| Per retrieval (%) | 26.7 | 40.0 |
| Per transfer (%) | 29.4 | 43.0 |
ART, assisted reproductive technology.
Fresh, non-donor cycles.
Not all countries in Europe report the number of initiated cycles. The data are from the last available year.
