Table 1.
Characteristics of study participants.
| Variables | DC (n = 872) |
MC (n = 526) |
p-Value |
|---|---|---|---|
| Age, years | 31.0 ± 4.2 | 29.0 ± 4.4 | <0.001 |
| Prepregnancy BMI, kg/m2 | 21.8 ± 3.0 | 21.2 ± 2.7 | 0.001 |
| Nulliparous, n (%) | 675 (77.4) | 331 (62.9) | <0.001 |
| Assisted conception, n (%) | 523 (60.0) | 48 (9.1) | <0.001 |
| GDM, n (%) | 269 (30.9) | 131 (24.9) | 0.017 |
| HDP, n (%) | 85 (9.8) | 43 (8.2) | 0.323 |
| Gestational weight gain, kg | 17.3± 5.8 | 17.6 ± 5.9 | 0.460 |
| Gestational age at delivery, weeks | 36.1 ± 2.0 | 35.5 ± 2.0 | <0.001 |
| Preterm birth < 34 weeks, n (%) | 101 (11.6) | 107 (20.3) | <0.001 |
| Cesarean delivery | 850 (97.5) | 509 (96.8) | 0.724 |
| Mean birthweight, g | 2442.2 ± 488.0 | 2212.5 ± 515.6 | <0.001 |
| Larger twin birthweight, g | 2587.0 ± 470.7 | 2375.3 ± 459.2 | <0.001 |
| Smaller twin birthweight, g | 2297.4 ± 461.6 | 2049.8 ± 517.9 | <0.001 |
| Intertwin weight discordance, % | 11.0 ± 10.2 | 14.2 ± 12.5 | <0.001 |
| Discordant twins, n (%) | 123 (14.1) | 141 (26.8) | <0.001 |
± represents SD. DC: dichorionic, MC: monochorionic, BMI: body mass index, GDM: gestational diabetes mellitus, HDP: hypertension disorders of pregnancy.