Table 2.
Characteristic | Liveborn Singletons After Fresh, Nondonor IVF Transcervical Embryo Transfer | Liveborn Neonates After Fresh, Nondonor IVF Transcervical Embryo Transfer |
---|---|---|
Total | 20,780 | 40,228 |
Birthweight (g) | ||
Less than 2,500 | 2,017 (9.7) | 13,501 (33.6) |
At least 2,500 | 18,763 (90.3) | 26,727 (66.4) |
Gestational age at delivery (wk) | ||
At least 37 | 18,071 (87.0) | 24,997 (62.1) |
Less than 37 | 2,709 (13.0) | 15,231 (37.9) |
Maternal age (y) | ||
Younger than 30 | 3,372 (16.2) | 7,277 (18.0) |
30–34 | 7,815 (37.6) | 16,239 (40.4) |
35–39 | 7,531 (36.2) | 13,679 (34.0) |
40–44 | 2,048 (9.9) | 3,010 (7.5) |
45 or older | 14 (0.1) | 23 (0.1) |
No. of previous pregnancies | ||
0 | 9,877 (47.6) | 19,472 (48.5) |
1 | 5,442 (26.3) | 10,493 (26.1) |
2 or more | 5,420 (26.1) | 10,192 (25.4) |
No. of previous births | ||
0 | 14,735 (71.5) | 28,756 (69.8) |
1 | 4,437 (21.5) | 8,391 (22.7) |
2 or more | 1,446 (7.0) | 2,781 (7.5) |
Race or ethnicity | ||
Unknown | 7,617 (36.7) | 14,584 (36.3) |
Non-Hispanic white | 10,143 (48.8) | 19,861 (49.4) |
Non-Hispanic black | 674 (3.2) | 1,306 (3.2) |
Hispanic | 994 (4.8) | 2,057 (5.1) |
Asian or Pacific Islander | 1,352 (6.5) | 2,420 (6.0) |
Infertility diagnosis* | ||
Tubal factor | 3,376 (16.3) | 6,686 (16.6) |
Endometriosis | 2,614 (12.6) | 5,320 (13.2) |
Uterine factor | 734 (3.5) | 1,376 (3.4) |
Ovulatory disorder | 3,489 (16.8) | 7,196 (17.9) |
Diminished ovarian reserve | 2,864 (13.8) | 4,756 (11.8) |
Male factor | 8,263 (39.8) | 16,317 (40.6) |
Use of ICSI† | ||
Yes | 15,047 (72.5) | 28,898 (71.9) |
No | 5,720 (27.5) | 11,303 (28.1) |
Use of assisted hatching‡ | ||
Yes | 7,536 (36.3) | 13,674 (34.0) |
No | 13,244 (63.7) | 26,554 (66.0) |
No. of supernumerary embryos cryopreserved | ||
Unknown | 102 (0.5) | 165 (0.4) |
0 | 11,623 (56.2) | 20,428 (51.0) |
1 or more | 9,055 (43.8) | 19,635 (49.0) |
No. of embryos transferred | ||
1 | 2,128 (10.2) | 2,211 (5.5) |
2 | 11,856 (57.1) | 24,288 (60.4) |
3 or more | 6,796 (32.7) | 13,729 (34.1) |
No. of fetal hearts on 6-wk ultrasound scan | ||
1 | 18,914 (91.4) | 18,996 (47.9) |
2 | 1,618 (7.8) | 18,364 (46.3) |
3 or more | 174 (0.8) | 2,278 (5.8) |
No. of days of embryo culture | ||
Unknown and all others | 1,592 (7.7) | 2,875 (7.2) |
5 | 8,621 (41.5) | 18,241 (45.3) |
3 | 10,567 (50.9) | 19,112 (47.5) |
No. of previous spontaneous abortions | ||
0 | 14,723 (70.9) | 28,817 (71.6) |
1 or more | 6,057 (29.2) | 11,411 (28.4) |
No. of previous ART cycles | ||
0 | 12,923 (62.2) | 25,456 (63.3) |
1 | 3,791 (18.2) | 7,080 (17.6) |
2 or more | 4,066 (19.6) | 7,688 (19.1) |
IVF, in vitro fertilization; ICSI, intracytoplasmic sperm injection; ART, assisted reproductive technology.
Data are n or n (%).
Percentages do not add up to 100 because the groups are not mutually exclusive (one patient may have multiple diagnoses).
Refers to the direct injection of sperm into an oocyte for the purpose of improving chances of fertilization.
Refers to treatments in which a minor defect is created in the zona pellucida for the purpose of improving chances of implantation.