Table 2.
Maternal Characteristics and Abnormally Invasive Placenta Risk Factors
| Maternal Demographics | Not Abnormally Invasive Placenta (n=47) |
Abnormally Invasive Placenta (n=42) |
P |
|---|---|---|---|
| Prepregnancy BMI (kg/m2) | 26.7±5.4 (18.1–43.0) | 26.1±5.3 (17.9–43.4) | .66 |
| Ethnicity | |||
| White (non-Hispanic) | 24 (50) | 22 (53) | .80 |
| Hispanic | 9 (19) | 11 (26) | 1.00 |
| Black | 4 (9) | 4 (9) | .70 |
| Asian | 3 (7) | 4 (9) | .20 |
| Other (including mixed race) | 7 (15) | 1 (2) | .06 |
| Parity | |||
| 0 | 5 (11) | 2 (5) | .40 |
| 1 | 22 (47) | 15 (36) | .40 |
| 2 | 12 (26) | 10 (24) | .60 |
| 3 or greater | 8 (17) | 15 (36) | .05 |
| Gestational age (wk) | |||
| At delivery | 37 1/7 (28 2/7–42) | 34 3/7 (21 5/7–26 4/7) | <.01 |
| At ultrasound scan | 32 1/7 (17 1/7–33 6/7) | 32 4/7 (15 2/7–39 2/7) | .80 |
| Hysterectomy performed | 3 (6) | 36 (86) | <.001 |
| Admission to ICU | 0 | 3 (7) | .10 |
| Abnormally invasive placenta risk factors | |||
| Prior cesarean delivery (0–8) | |||
| 0 | 10 (21) | 2 (5) | .03 |
| 1 | 22 (47) | 21 (50) | .80 |
| 2 | 9 (19) | 9 (21) | 1.00 |
| 3 or more | 6 (13) | 10 (24) | .30 |
| Placenta previa | |||
| Major placenta previa (placenta over os) | 17 (36) | 32 (76) | <.001 |
| Marginal placenta previa (2 cm or less from os) | 7 (15) | 7 (17) | 1.00 |
| Cesarean delivery scar and major placenta previa | 11 (23) | 30 (71) | <.001 |
| Previous uterine surgery | |||
| Evacuation of retained products of conception | 9 (19) | 13 (31) | .23 |
| Myomectomy | 3 (6) | 2 (5) | 1.0 |
| Transcervical resection of fibroids | 1 (2) | 1 (2) | 1.0 |
| Endometrial ablation | 0 | 1 (2) | .10 |
| Assisted reproductive technology | 1 (2) | 3 (7) | .30 |
BMI, body mass index; ICU, intensive care unit.
Data are mean±standard deviation (range), n (%), or median (range) unless otherwise specified.