Table 1. Characteristics and periodic features in patients grouped by endometrial thickness on the embryo transfer day.
| Group | EN ≤6 mm | EN 6–7 mm | EN 7–8 mm | EN 8–9 mm | EN 9–10 mm | EN 10–11 mm | EN 11–12 mm | EN 12–13 mm | EN>13 mm | P-value |
|---|---|---|---|---|---|---|---|---|---|---|
| N | 235 | 445 | 1526 | 3338 | 2299 | 1218 | 615 | 291 | 198 | |
| Age | 34.06 ± 6.19 | 33.54 ± 6.09 | 32.36 ± 5.92 | 31.17 ± 5.60 | 30.99 ± 5.42 | 31.08 ± 5.27 | 31.69 ± 5.71 | 31.84 ± 5.49 | 32.67 ± 6.50 | <0.001 |
| Duration of infertility | 3.44 ± 2.82 | 3.73 ± 3.13 | 4.06 ± 2.99 | 4.05 ± 2.89 | 4.30 ± 3.30 | 4.31 ± 3.27 | 4.62 ± 3.44 | 4.38 ± 3.53 | 5.11 ± 3.57 | <0.001 |
| BMI | 22.74 ± 3.07 | 23.18 ± 3.74 | 23.02 ± 3.42 | 22.87 ± 4.24 | 23.04 ± 4.63 | 23.33 ± 7.47 | 23.47 ± 3.32 | 23.69 ± 3.70 | 23.80 ± 3.64 | <0.001 |
| No. of embryo transferred | 1.81 ± 0.43 | 1.82 ± 0.43 | 1.83 ± 0.41 | 1.85 ± 0.38 | 1.85 ± 0.38 | 1.84 ± 0.37 | 1.86 ± 0.35 | 1.85 ± 0.37 | 1.81 ± 0.43 | 0.273 |
| Infertility type | <0.001 | |||||||||
| Primary Infertility | 25.33% (58/229) | 26.09% (114/437) | 41.26% (621/1505) | 52.78% (1727/3272) | 56.01% (1267/2262) | 59.00% (705/1195) | 60.23% (362/601) | 57.19% (163/285) | 56.48% (109/193) | |
| Secondary infertility | 74.67% (171/229) | 73.91% (323/437) | 58.74% (884/1505) | 47.22% (1545/3272) | 43.99% (995/2262) | 41.00% (490/1195) | 39.77% (239/601) | 42.81% (122/285) | 43.52% (84/193) | |
| Embryo type | 0.433 | |||||||||
| Embryos in cleavage stage | 76.17% (179/235) | 74.83% (333/445) | 72.94% (1113/1526) | 72.44% (2418/3338) | 71.58% (1645/2298) | 70.11% (854/1218) | 73.98% (455/615) | 71.82% (209/291) | 73.23% (145/198) | |
| Blastocyst | 23.83% (56/235) | 25.17% (112 /445) | 27.06% (413/1526) | 27.56% (920/3338) | 28.42% (653/2298) | 29.89% (854/1218) | 26.02% (160/615) | 28.18% (82/291) | 26.77% (53/198) |