| Table 1. Results. Group 1, sperm selection by density gradient and group 2, sperm selection by Z-potential | ||||
| Clinical Outcomes | Total (%) | Group 1 (%) | Group 2 (%) | p value |
| n of patients | 290 | 149 | 141 | - |
| n of mature oocytes | 2641 | 1361 | 1280 | - |
| Fertilization rate (%) | 2081 (78.80) | 1085 (79.7) | 996 (77.81) | NS |
| Blastocyst development (%) | 979 (47.04) | 484 (44.60) | 495 (49.70) | NS |
| n of transferred embryos | 550 | 283 | 267 | - |
| Positiveβ-hCG (%) | 180 (62.06) | 90 (60.40) | 90 (63.83) | NS |
| Clinical pregnancy rate (%) | 152 (52.41) | 75 (50.34) | 77 (54.61) | NS |
| Implantation rate (%) | 206 (37.45) | 97 (34.28) | 109 (40.82) | NS |