| Table 5. Degree of transfer difficulty and efficiency parameters over time for the semi-rigid catheter | ||||
| Quartiles | ||||
| First (n=90) | Second (n=90) | Third (n=90) | Fourth (n=93) | |
| Transferred embryos | 2.5 ± 0.8 | 2.8 ± 1.1 | 2.9 ± 1.0 | 2.7 ± 0.9 |
| Blood after ET | 8/90 (8.9%) | 7/90 (7.8%) | 9/90 (10.0%) | 12/93 (12.9%) |
| Use of a tenaculum | 22/90 (24.4%) | 20/90 (22.2%) | 14/90 (15.6%) | 16/93 (17.2%) |
| Use of a hysterometer | 3/90 (3.3%) | 5/90 (5.6%) | 4/90 (4.4%) | 6/93 (6.5%) |
| US guidance required | 8/90 (8.9%) | 10/90 (11.1%) | 8/90 (8.9%) | 6/93 (6.5%) |
| Embryos retained in catheter | 1/90 (1.1%) | 2/90 (2.2%) | 5/90 (5.6%) | 4/93 (4.3%) |
| Implantation rate | 30/238 (12.6%) | 31/241 (12.9%) | 25/230 (10.9%) | 39/253 (15.4%) |
| Clinical pregnancy rate | 25/90 (27.8%) | 20/90 (22.2%) | 24/90 (26.7%) | 24/93 (25.8%) |
| Miscarriage | 3/25 (12.0%) | 3/20 (15.0%) | 4/24 (16.7%) | 6/24 (25.0%) |
| Ectopic pregnancy | 0/25 (0%) | 1/20 (5.0%) | 1/24 (4.2%) | 0/24 (0%) |
| Take home baby rate | 22/90 (24.4%) | 16/90 (17.8%) | 19/90 (21.1%) | 18/93 (19.4%) |