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. 2023 Feb 7;38(4):739–750. doi: 10.1093/humrep/dead021

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.