TABLE 1.
eSET (n = 4,129) | DET (n = 10,001) | ||||
---|---|---|---|---|---|
Characteristic | N | % | N | % | P value |
Age (y) | .63 | ||||
≤30 | 1,872 | 45.3 | 4,602 | 46.0 | |
31–32 | 1,168 | 28.3 | 2,743 | 27.4 | |
33–34 | 1,089 | 26.4 | 2,656 | 26.6 | |
Gravidity | .39 | ||||
0 | 2,657 | 64.5 | 6,363 | 63.8 | |
1 | 839 | 20.4 | 1,990 | 20.0 | |
≥2 | 623 | 15.1 | 1,618 | 16.2 | |
Parity | .07 | ||||
0 | 3,394 | 82.5 | 8,406 | 84.4 | |
1 | 546 | 13.3 | 1,123 | 11.3 | |
≥2 | 174 | 4.2 | 430 | 4.3 | |
Racea | <.001 | ||||
Non-Hispanic white | 2,110 | 73.1 | 5,007 | 73.0 | |
Non-Hispanic black | 160 | 5.5 | 452 | 6.6 | |
Asian/Pacific Islander | 429 | 14.9 | 730 | 10.6 | |
Hispanic | 182 | 6.3 | 661 | 9.6 | |
Other | 5 | 0.2 | 14 | 0.2 | |
Body mass index (BMI)a | <.001 | ||||
<18.5 | 133 | 3.8 | 252 | 3.1 | |
18.5–24.9 | 2,030 | 58.6 | 4,450 | 55.0 | |
25–29.9 | 800 | 23.1 | 1,951 | 24.1 | |
≥30 | 500 | 14.4 | 1,442 | 17.8 | |
ART diagnoses (not mutually exclusive) | |||||
Female factor infertility | |||||
Diminished ovarian reserve | 178 | 4.3 | 641 | 6.4 | <.001 |
Endometriosis | 365 | 8.8 | 1,217 | 12.2 | <.001 |
Ovulation disorders | 986 | 23.9 | 2,264 | 22.6 | .16 |
Tubal factor | 574 | 13.9 | 1,596 | 16.0 | .02 |
Uterine factor | 178 | 4.3 | 362 | 3.6 | .11 |
Male factor infertility | 1,586 | 38.4 | 4,183 | 41.8 | .006 |
Other reason for infertility | 487 | 11.8 | 898 | 9.0 | <.001 |
Unexplained infertility | 734 | 17.8 | 1,449 | 14.5 | <.001 |
No. of oocytes retrieved | <.001 | ||||
2–4 | 43 | 1.0 | 81 | 0.8 | |
5–9 | 486 | 11.8 | 1,472 | 14.7 | |
10–14 | 1,007 | 24.4 | 2,882 | 28.8 | |
15–19 | 1,102 | 26.7 | 2,629 | 26.3 | |
≥20 | 1,491 | 36.1 | 2,937 | 29.4 | |
Assisted hatching | 539 | 13.1 | 2,391 | 23.9 | <.001 |
Intracytoplasmic sperm injection | 2,843 | 68.9 | 7,797 | 78.0 | <.001 |
Preimplantation genetic diagnosis | 245 | 5.9 | 326 | 3.3 | <.001 |
Embryo stageb | <.001 | ||||
Cleavage (day 2–3) | 371 | 9.0 | 2,927 | 29.3 | |
Blastocyst (day 5–6) | 3,721 | 90.1 | 6,862 | 68.6 | |
No. of embryos cryopreserved | <.001 | ||||
1–2 | 1,141 | 27.6 | 4,045 | 40.5 | |
3–5 | 1,654 | 40.1 | 3,640 | 36.4 | |
≥6 | 1,334 | 32.3 | 2,316 | 23.2 |
Note: ART = assisted reproductive technology.
Race data were missing for 30% of the eSET group and 31% of the DET group. BMI data were missing for 16% of the eSET group and 19% of the DET group. Percentages and P values were calculated for the data available.
A small percentage of transfers occurred on days 1 and 4. Data not shown.