Table 1.
The characteristics of study population of ART pregnancies.
| Characteristics | ART Pregnancies n = 1511 |
% |
|---|---|---|
| Maternal age (years) | - | |
| Mean ± SD | 37.7 ± 4.71 | |
| range | 22–55 | |
| Gestational age at ultrasound (weeks) | - | |
| Mean ± SD | 23 ± 4.16 | |
| range | 16–37 | |
| Type of exam | ||
| standard cardiac scan (fetal medicine susbspec.) | 1124 | 74.4 |
| fetal echocardiography (fetal cardiologist) | 387 | 25.6 |
| Pregnancy order | ||
| singletons | 1242 | 82.2 |
| multiples | 269 | 17.8 |
| twins | 264 | 98.1 ° |
| triplets | 5 | 1.9 ° |
| dichorionic | 230 | 85.5 ° |
| monochorionic | 39 | 14.5 ° |
| Method of conception | ||
| Homologous ART | 1320 | 87.3 |
| IVF | 547 | 36.2 |
| ICSI | 773 | 51.1 |
| Heterologous ART | 191 | 12.6 |
| Cardiac anatomy | ||
| CHD | 29 | 1.92 |
| non-CHD | 1482 | 98.08 |
ART—assisted reproductive technology, CHD—congenital heart defects, IVF—in vitro fertilization, ICSI—intracytoplasmic sperm injection, OD—oocyte donation, subspec.—subspecialist. Continuous variables: mean, standard deviation (SD), range. Categorical variables: frequency and percentage. ° The percentage was calculated on the total of multiple pregnancies (n = 269).