Table I.
Maternal and cycle characteristics in singleton pregnancies after preimplantation genetic testing (PGT), IVF/ICSI, and spontaneous conception in Sweden 1996–2019.
| PGT | IVF/ICSI | Spontaneous conception | |
|---|---|---|---|
| Deliveries, n | 390 | 61 060 | 42 034 |
| Year of birth of child, n (%) | |||
| 1996–2003 | 7 (1.8) | 10 188 (16.7) | 659 (1.6) |
| 2004–2011 | 68 (17.4) | 22 395 (36.7) | 7651 (18.2) |
| 2012–2019 | 315 (80.8) | 28 477 (46.6) | 33 724 (80.2) |
| Maternal age, mean ± SD | 33.2 ± 3.5 | 33.8 ± 4.2 | 32.2 ± 4.0 |
| Primiparous, n (%) | 156 (40.0) | 41 426 (67.8) | 16 110 (38.3) |
| Smoking at first antenatal visit, n (%) | 3 (0.8) | 1547 (2.5) | 1426 (3.4) |
| Missing, n (%) | 22 (5.6) | 3537 (5.8) | 2107 (5.0) |
| BMI, mean ± SD | 24.1 (3.9) | 24.4 (4.0) | 24.43 (4.4) |
| Missing, n (%) | 24 (6.2) | 5251 (8.6) | 2374 (5.6) |
| Years of infertility, median (Q1–Q3) | 2 (1–3) | 3 (2–4) | 1 (1–2) |
| Duration of infertility missing, n (%) | 175 (44.9) | 13 321 (21.8) | 38 703 (92.1) |
| Fertilization method, n (%) | |||
| IVF | 53 (13.6) | 32 929 (53.9) | NA |
| ICSI | 337 (86.4) | 28 131 (46.1) | NA |
| Culture duration at embryo transfer, n (%) | |||
| Day 2–3 | 8 (2.1) | 36 077 (59.1) | NA |
| Day 4 | 185 (47.4) | 197 (0.3) | |
| Day 5–6 | 195 (50.0) | 15 433 (25.3) | NA |
| Day 7 | – | 3 (0.3) | |
| Missing | 2 (0.5) | 9350 (15.3) | NA |
| Cycle type, n (%) | |||
| Fresh transfer | 258 (66.2) | 43 065 (70.5) | NA |
| Frozen transfer | 132 (33.8) | 17 995 (29.5) | NA |
| Freezing technique | |||
| Vitrification | 98 (74.2) | 10 256 (57.0) | NA |
| Slow-freezing | 34 (25.8) | 7736 (43.0) | NA |
| Missing | 0 (0.0) | 3 (0.0) | NA |
| Number of embryos transferred, n (%) | |||
| 1 | 335 (85.9) | 43 864 (71.8) | NA |
| ≥2 | 50 (12.8) | 9125 (14.9) | NA |
| Missing | 5 (1.3) | 8071 (13.2) | NA |
Q1–Q3, first and third quartiles; NA, not applicable.