Table 1 Comparisons of baseline characteristics between twin pregnancies in three groups
Variables | Group A Twin pregnancies with UFs (n = 191) | Group B Twin pregnancies with previous myomectomy (n = 89) | Group C Twin pregnancies without UFs (n = 1077) | A vs B vs C p-value | A vs B p-value | A vs C p-value | B vs C p-value |
|---|---|---|---|---|---|---|---|
Maternal age (year) | 35.2 ± 3.2 | 35.8 ± 2.8 | 33.9 ± 3.1 | < 0.001 | 0.125 | < 0.001 | < 0.001 |
(35,24–44) | (36, 31–43) | (34, 23–45) | |||||
BMI at delivery (kg/m2) | 27.0 ± 2.9 | 27.5 ± 3.6 | 26.9 ± 3.1 | 0.250 | 0.228 | 0.741 | 0.097 |
(26.7, 19.3–35.2) | (27.4, 20.7–41.0) | (26.6, 18–39.3) | |||||
Medical history, number (%) | |||||||
Prepregnancy HTN | 2 (1.0%) | 0 (0%) | 10 (0.9%) | 0.645 | 1.0 | 0.700 | 1.0 |
Prepregnancy diabetes | 2 (1.0%) | 0 (0%) | 3 (0.3%) | 0.227 | 1.0 | 0.166 | 1.0 |
Primiparity | 177 (92.7%) | 78 (87.6%) | 917 (85.1%) | 0.019 | 0.169 | 0.004 | 0.640 |
Previous preterm birth | 2 (1.0%) | 0 (0%) | 14 (1.3%) | 0.542 | 1.0 | 1.0 | 0.617 |
Mode of conception | 0.104 | 0.201 | 0.527 | 0.034 | |||
Natural or TI, COH + TI | 23 (12.0%) | 6 (6.7%) | 163 (15.1%) | ||||
IUI or COH + IUI | 15 (7.9%) | 4 (4.5%) | 86 (8.0%) | ||||
IVF or T-ET | 153 (80.1%) | 79 (88.8%) | 828 (76.9%) | ||||
Chorionicity | 0.370 | 0.185 | 0.327 | 0.542 | |||
Monochorionic | 20 (10.5%) | 5 (5.6%) | 89 (8.3%) | ||||
Dichorionic | 171 (89.5%) | 84 (94.4%) | 988 (91.7%) | ||||