Table 1.
Participant and cycle characteristics for the first cycle.
| Endometrial thickness | |||||
|---|---|---|---|---|---|
|
|
|||||
| Characteristic | All women (n = 6331) | ≤7 mm (n = 347) | 7 to <11 mm (n = 2943) | ≥11 mm (n = 3041) | p |
| Age (years) | 35.6 (32.2–39.2) | 36.0 (32.4–39.5) | 35.8 (32.2–39.4) | 35.4 (32.3–38.9) | 0.07 |
| Body mass index | 24.0 (21.7–28.1) | 24.0 (21.6–29.1) | 24.0 (21.6–28.0) | 24.0 (21.8–28.1) | 0.92 |
| Gravidity | 0.93 | ||||
| 0 | 3363 (53.1) | 184 (53.0) | 1575 (53.5) | 1604 (52.8) | |
| 1 | 1492 (23.6) | 82 (23.6) | 678 (23.0) | 732 (24.1) | |
| 2 or more | 1476 (23.3) | 81 (23.3) | 690 (23.5) | 705 (23.2) | |
| Parity | <0.001 | ||||
| 0 | 4789 (75.6) | 277 (79.8) | 2312 (78.6) | 2200 (72.3) | |
| 1 | 1172 (18.5) | 54 (15.6) | 489 (16.6) | 629 (20.7) | |
| 2 or more | 370 (5.8) | 16 (4.6) | 142 (4.8) | 212 (7.0) | |
| Oocytes retrieved | 10.0 (6.0–15.0) | 9.0 (6.0–14.0) | 9.0 (6.0–14.0) | 10.0 (6.0–15.0) | 0.02 |
| Embryos transferreda | 0.71 | ||||
| 0 | 356 (9.1) | 24 (11.4) | 154 (9.1) | 178 (8.8) | |
| 1 | 612 (15.6) | 28 (13.3) | 257 (15.1) | 327 (16.2) | |
| 2 | 2115 (53.8) | 118 (55.9) | 914 (53.7) | 1083 (53.7) | |
| ≥3 | 847 (21.6) | 41 (19.4) | 377 (22.2) | 429 (21.3) | |
| Embryos frozena | 0.69 | ||||
| 0 | 3614 (60.5) | 185 (61.9) | 1686 (61.0) | 1743 (59.9) | |
| 1–2 | 1089 (18.2) | 48 (16.1) | 512 (18.5) | 529 (18.2) | |
| 3–4 | 621 (10.4) | 31 (10.4) | 285 (10.3) | 305 (10.5) | |
| ≥5 | 647 (10.8) | 35 (11.7) | 279 (10.1) | 333 (11.4) | |
| Cycles cancelledb | 151 (2.4) | 32 (9.2) | 90 (3.1) | 29 (1.0) | <0.001 |
| Peak oestradiol (pg/mL) | 1711 (1012–2691) | 1331 (804–2447) | 1676 (984–2677) | 1767 (1052–2719) | <0.001 |
| Progesterone (ng/mL) | 0.8 (0.5–1.3) | 0.8 (0.5–1.3) | 0.8 (0.5–1.2) | 0.8 (0.5–1.3) | 0.76 |
Data are presented as median (interquartile range) or n (%).
a
Calculated among cycles with an oocyte retrieval.
b
Calculated only among cycles cancelled at or after the time of trigger.