|  | Clinic A | Clinic B |
---|---|---|---|
Couples | Â | 706 | 1064 |
Number of analyzed embryos (fresh transfer) | Â | 784 | 1274 |
Female age (years) |  | 34.3 (30.4–38.6) | 35.5 (31.8–39.0) |
Fertilization method | IVF | 233 (33%) | 107 (10.0%) |
ICSI | 473 (67%) | 959 (90.0%) | |
Culture medium | Sage 1 | 479 (67.8%) | 544 (51.1%) |
Sage CM | 0 (0%) | 491 (46.1%) | |
Vitrolife | 228 (32.2%) | 29 (2.7%) | |
Oxygen | Â | 7% | atmospheric |
Carbon dioxide |  | 5–6% | 5–6% |
Temperature (°C) |  | 36.8 | 36.9 |