Table 2.
Fertilization rate and blastocyst formation rate in age-specific groups
| Sequential medium | Single-step medium | Relative risk | 95% confidence interval | p value | |
|---|---|---|---|---|---|
| Age < 38 (n) | 183 | 249 | |||
| Fertilization rate | 69.8% | 67.8% | 0.9707 | 0.9181–1.0264 | 0.527 |
| Blastocyst rate per 2PN | 50.2% | 52.2% | 1.0402 | 0.9700–1.1155 | 0.484 |
| High-grade blastocyst rate per 2PN | 44.1% | 40.2% | 0.9130 | 0.8285–1.0061 | 0.166 |
| No blastocyst formed cycle (n, %) | 23 (12.6%) | 34 (13.7%) | 1.0864 | 0.6632–1.7797 | 0.775 |
| Age ≥ 38 (n) | 164 | 270 | |||
| Fertilization rate | 70.3% | 65.1% | 0.9272 | 0.8584–1.0014 | 0.310 |
| Blastocyst rate per 2PN | 33.6% | 48.0% | 1.4290 | 1.2844–1.5897 | < 0.001 |
| High grade blastocyst rate per 2PN | 27.0% | 31.6% | 1.1677 | 0.9767–1.3961 | 0.134 |
| No blastocyst formed cycle (n, %) | 52 (31.7%) | 81 (30.0%) | 0.9462 | 0.7085–1.2635 | 0.748 |