Table 1.
Patient baseline characteristics.
| All | Anteverted | Retroverted | ||
|---|---|---|---|---|
| Number | 96 | 71 | 25 | p |
| Age (years) | 35.23 ± 5.05 | 35.08 ± 4.68 | 35.7 ± 6.0 | 0.62 |
| 35 or older | 55 (57.3%) | 43 (60.6%) | 12 (48.0%) | 0.35 |
| Primipara | 37 (38.5%) | 19 (26.8%) | 18 (72.0%) | 0.0001 |
| Maternal BMI a (range) | 23.5 ± 3.5 (17.4–41.0) |
23.6 ± 3.4 (17.4–41.0) |
23.2 ± 2.3 (19.4–27.8) |
0.42 |
| Birth weight b | 2560.1 ± 392.9 (1742–3770) |
2581 ± 384.9 (1742–3770) |
2500.3 ± 420.3 (1750–3160) |
0.31 |
| Number of previous CD | ||||
| 0 | 54 (56.2%) | 35 (49.3%) | 19 (76.0%) | 0.035 |
| 1 | 21 (21.9%) | 16 (22.5%) | 5 (20.0%) | 0.58 |
| 2 or more | 21 (21.9%) | 20 (28.2%) | 1 (4.0%) | 0.01 |
| IVF pregnancy | 13 (13.5%) | 7 (9.9%) | 6 (24.0%) | 0.09 |
| MRI examination (weeks) | 30.4 ± 3.4 | 30.2 ± 3.6 | 30.8 ± 2.8 | 0.42 |
| Less than 26 | 10 (10.4%) | 9 (12.7%) | 1 (4.0%) | 0.45 |
| 27–29 | 26 (27.1%) | 20 (28.2%) | 6 (24.0%) | 0.80 |
| 30–32 | 29 (30.2%) | 19 (26.8%) | 10 (40.0%) | 0.31 |
| 33 or more | 31 (32.3%) | 23 (32.3%) | 8 (32.0%) | 1.0 |
| Location of placenta | ||||
| Anterior | 25 (26.0%) | 24 (33.8%) | 1 (4.0%) | 0.0030 |
| Central | 30 (31.3%) | 25 (35.2%) | 5 (20.0%) | 0.21 |
| Posterior | 41 (42.7%) | 22 (31.0%) | 19 (76.0%) | 0.00013 |
| GA at delivery(weeks) | 35.5 ± 2.57 (19–39) |
35.4 ± 0.5 (19–39) |
35.9 ± 1.78 (29–38) |
0.39 |
| Less than 27 | 1 (1.0%) | 1 (1.4%) | 0 (0%) | 1 |
| 27–30 | 1 (1.0%) | 1 (1.4%) | 0 (0%) | 1 |
| 31–35 | 42 (43.8%) | 32 (45.1%) | 10 (40.0%) | 0.82 |
| 36 or more | 52 (54.2%) | 37 (52.1%) | 15 (60.0%) | 0.64 |
| Operative procedure | ||||
| Cesarean hysterectomy | 34 (35.4%) | 30 (45.1%) | 4 (16.0%) | 0.027 |
| CD | 62 (64.5%) | 41 (54.9%) | 21 (84.0%) | |
| Histopathological diagnosis | 34 | |||
| Placenta accreta | 12 (12.5%) | 9 (12.6%) | 3 (12.0%) | 1.0 |
| Placenta increta | 12 (12.5%) | 11 (15.5%) | 1 (4.0%) | 0.175 |
| Placenta percreta | 7 (7.3%) | 7 (9.9%) | 0 | 0.184 |
| Non-invasive placenta | 2 (2.1%) | 2 (2.8%) | 0 | 1.0 |
| Not performed | 1 (1%) | 1 (1.4%) | 0 | 1.0 |
Abbreviations: CD, cesarean delivery; GA, gestational age; IVF, in vitro fertilization; MRI, magnetic resonance imaging. a Calculated as weight in kilograms divided by the square of height in meters, b A case of abortion was excluded.