Table 1.
Characteristics of the participants
| Characteristic | Scratch group (n=22) | Control group (n=55) | P |
|---|---|---|---|
| Mean age (years) | 35.50±2.89 | 35.62±2.72 | NS |
| Duration of infertility (years) | 2.78±1.93 | 3.10±2.41 | NS |
| Type of subinfertility (N) | |||
| Primary | 18 | 35 | NS |
| Secondary | 4 | 20 | |
| Number of transferred blastocysts | 1.14±.35 | 1.07±.26 | NS |
| Thickness of the endometrium (mm) | 11.01±2.03 | 11.94±2.40 | NS |
| Previous cycles of failed ETs | 3.59±.91 (3–6) | 4.13±2.04 (3–16) | NS |
| Causes of infertility, N (%) | |||
| Male factor | 6 (27.3) | 9 (16.4) | NS |
| PCO | 3 (13.6) | 6 (10.9) | |
| POF | 0 (.0) | 1 (1.8) | |
| Endometriosis | 1 (4.5) | 1 (1.8) | |
| Tubal factor | 8 (36.4) | 30 (54.5) | |
| Unexplained | 1 (4.5) | 3 (5.5) | |
| Mixed | 3 (13.6) | 5 (9.1) | |
| Grade of the transferred blastocyst, N (%) | |||
| <G4ABa | 11 (50) | 39 (70.9) | NS |
| ≥G4ABa | 11 (50) | 16 (29.1) | |
aSystems of Gardner and Schoolcraft blastocyst grading classification. ET, embryo transfer; NS, not significant; PCO, polycystic ovarian; POF, premature ovarian failure.