Table 3. Characteristics of women with multiple pregnancy with and without pregnancy complications.
| Characteristic | Total | Pregnancy with complications* | Pregnancy without complications | P-value |
|---|---|---|---|---|
| Number of women | 3246 | 1553 | 1693 | |
| Mean (SD) | ||||
| Age (years) | 30.2 (7.0) | 30.2 (4.5) | 30.0 (4.3) | 0.17 |
| Weight (kg) | 55.6 (8.9) | 55.5 (8.7) | 55.5 (8.2) | 0.35 |
| Height (cm) | 161.2 (5.4) | 160.7 (4.9) | 161.3 (5.0) | 0.05 |
| No. (%) | ||||
| Twin births | 3101 (95.5) | 1498 (96.5) | 1603 (94.7) | 0.05 |
| Education level | ||||
| Above bachelor degree | 232 (7.1) | 96 (6.0) | 136 (8.0) | < 0.01 |
| Alcohol drinking (yes) | 4 (0.1) | 2 (0.2) | 2 (0.09) | 0.89 |
| Cigarette smoking (yes) | 4 (0.1) | 3 (0.3) | 1 (0.04) | 0.61 |
| Regular antenatal care | 2129 (65.6) | 1213 (78.1) | 916 (54.1) | < 0.05 |
| ART | 1574 (48.5) | 788 (50.7) | 786 (46.4) | < 0.05 |
| IVF-ET | 1260 (80.1) | 656 (42.2) | 604 (35.7) | |
| Induction of ovulation | 196 (12.5) | 87 (5.6) | 109 (6.4) | |
| Artificial insemination and others | 118 (7.5) | 45 (5.7) | 73 (9.3) | |
ART, assisted reproductive technology; IVF-ET, in vitro fertilization and embryo transfer; SD, standard deviation.
*
Pregnancy complications included gestational hypertension, gestational diabetes mellitus, preterm birth, and pregnancy complicated with internal medicine, surgical, or infectious disease.