Table 1.
Maternal characteristics Based on the Presence or Absence of an Intrauterine Hematoma Before 14 Weeks of Gestation
| Characteristics | AP (N = 209) N(%) |
NP (N = 774) N(%) |
P value |
|---|---|---|---|
| Maternal age | 30.00 ± 4.31 | 30.55 ± 4.70 | 0.127 |
| Previous term delivery | 52 (26.13) | 276 (35.66) | 0.01 |
| Previous Preterm birth | 13 (6.22) | 38 (4.90) | 0.24 |
| Previous miscarriage | 93 (46.73) | 297 (38.37) | 0.03 |
| Conceived methods | < 0.001 | ||
| Natural conception | 107 (51.44) | 521 (67.40) | |
| Assisted conception | 101 (48.56) | 250 (32.60) | |
| Chorionicity of twin | 0.22 | ||
| MCDA | 53 (25.36) | 236 (31.01) | |
| DCDA | 152 (72.73) | 512 (67.28) | |
| Accompanied bleeding | 141 (67.46) | 104 (13.43) | < 0.001 |
| Gestational age at first scan (wk) | 0.83 | ||
| 5 0/7–5 6/7 | 38 (18.18) | 125 (16.15) | |
| 6 0/7–6 6/7 | 40 (19.14) | 132 (17.12) | |
| 7 0/7–7 6/7 | 41 (19.62) | 148 (19.14) | |
| 8 0/7–8 6/7 | 44 (21.05) | 155 (20.02) | |
| 9 0/7–9 6/7 | 19 (9.09) | 92 (11.89) | |
| 10 0/7–10 6/7 | 8 (3.82) | 33 (4.26) | |
| 11 0/7–11 6/7 | 7 (3.35) | 43 (5.50) | |
| 12 0/7–12 6/7 | 6 (2.87) | 28 (3.67) | |
| 13 0/7–13 6/7 | 6 (2.87) | 17 (2.25) |
AP Adverse pregnancy, NP Normal group, MCDA Monochorionic diamniotic, DCDA Dichorionic diamniotic. Values are the mean and standard deviation or number (percentage) unless otherwise indicated. P values were determined with the chi-square test for categorical variables or Student’s t test for continuous variables. P < 0.05 indicates statistical significance