Table 1 Details of the analysis cohort of 337,148 cycles of IVF from 202,968 women
Number of cycles | Whole cohort, 337,148 | Segmented cycles, 8393 (2.5%) | Non-segmented cycles, 328,755 (97.5%) |
|---|---|---|---|
Patient age | |||
 Less than 35 years | 148,998 (44.2%) | 5247 (62.5%) | 143,751 (43.7%) |
 35–39 years | 134,931 (40.0%) | 2530 (30.1%) | 132,401 (40.3%) |
 More than 39 years | 53,219 (15.8%) | 616 (7.3%) | 52,603 (16.0%) |
Cause of infertility (may be none or more than one) | |||
 Male factor | 142,982 (42.4%) | 3402 (40.5%) | 139,580 (42.5%) |
 Tubal | 61,527 (18.2%) | 1557 (18.6%) | 59,970 (18.2%) |
 Ovulatory | 40,696 (12.1%) | 1814 (21.6%) | 38,882 (11.8%) |
 Endometriosis | 21,333 (6.3%) | 448 (5.3%) | 20,885 (6.4%) |
Cycle number | |||
 First cycle | 173,776 (51.5%) | 5625 (67.0%) | 168,151 (51.1%) |
 Later cycle | 163,372 (48.5%) | 2768 (33.0%) | 160,604 (48.9%) |
Oocytes collected | |||
 1–3 | 31,291 (9.3%) | 172 (2.0%) | 31,119 (9.5%) |
 4–9 | 141,837 (42.1%) | 936 (11.2%) | 140,901 (42.9%) |
 10–15 | 103,820 (30.8%) | 1351 (16.1%) | 102,469 (31.2%) |
 16+ | 60,200 (17.9%) | 5934 (70.7%) | 54,266 (16.5%) |
Stage of the embryo at first transfer (% non-missing) | |||
 Cleavage | 270,919 (82.2%) | 3742 (70.4%) | 267,177 (82.4%) |
 Blastocyst | 58,702 (17.8%) | 1577 (29.6%) | 57,125 (17.6%) |
 Missing (% all cycles) | 7527 (2.2%) | 3074 (36.7%) | 4453 (1.4%) |
At least one live birth following ovarian stimulation | 105,174 (31.2%) | 2748 (32.7%) | 102,426 (31.2%) |