Table 2.
Distribution of 2008 Liveborn Neonates After Fresh, Nondonor In Vitro Fertilization Transcervical Embryo Transfer by Characteristics
| 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.