Table 1.
Baseline characteristics for patients with and without subchorionic hematoma.
| Characteristic | No SCH (n = 817) | SCH (n = 184) | P value |
|---|---|---|---|
| Age (y) | .737 | ||
| <35 | 527 (64.6) | 126 (68.5) | |
| 35–37 | 169 (20.7) | 33 (17.9) | |
| 38–40 | 97 (11.9) | 18 (9.8) | |
| 41–42 | 20 (2.5) | 6 (3.3) | |
| >42 | 3 (0.4) | 1 (0.5) | |
| BMI (kg/m2) | .273 | ||
| <18.5 | 19 (2.3) | 3 (1.6) | |
| 18.5–25 | 365 (44.8) | 94 (51.4) | |
| 25–30 | 224 (27.5) | 39 (21.3) | |
| >30 | 206 (25.3) | 47 (25.7) | |
| Race | .354 | ||
| White | 692 (84.7) | 164 (87.7) | |
| Black | 34 (4.2) | 5 (2.7) | |
| Asian | 50 (6.1) | 10 (5.3) | |
| Hispanic | 9 (1.1) | 3 (1.6) | |
| Other | 16 (2) | 5 (2.7) | |
| Unknown | 16 (2) | 0 (0) | |
| IVF method | .338 | ||
| Fresh embryo transfer | 649 (79.4) | 142 (75.9) | |
| Frozen embryo transfer | 168 (20.6) | 45 (24.1) | |
| Prior live birth | .388 | ||
| No | 606 (74.2) | 145 (77.5) | |
| Yes | 211 (25.8) | 42 (22.5) | |
| Prior pregnancy | .811 | ||
| No | 430 (52.6) | 96 (51.3) | |
| Yes | 387 (47.4) | 91 (48.7) | |
| Smoker | .394 | ||
| No | 796 (97.7) | 179 (96.2) | |
| Yes | 19 (2.3) | 7 (3.8) | |
| Short-interval pregnancya | .068 | ||
| No | 784 (98.2) | 179 (95.7) | |
| Yes | 14 (1.8) | 8 (4.3) | |
| Day of embryo transfer | .681 | ||
| Day 3 | 392 (48) | 86 (46) | |
| Day 5 | 425 (52) | 101 (54) | |
| No. of embryos transferred | .487 | ||
| 1 | 187 (22.9) | 34 (18.2) | |
| 2 | 505 (61.8) | 127 (67.9) | |
| 3 | 96 (11.8) | 17 (9.1) | |
| 4 | 21 (2.6) | 7 (3.7) | |
| 5 | 7 (0.9) | 2 (1.1) | |
| 6 | 1 (0.1) | 0 (0) | |
| Congenital or genetic defects | 1.00 | ||
| No | 730 (96.1) | 165 (95.9) | |
| Yes | 30 (3.9) | 7 (4.1) |
Note: Data presented as n (%), unless specified otherwise. BMI = body mass index; IVF = in vitro fertilization; SCH = subchorionic hematoma.
a
Defined as less than 18 months between the delivery date of the preceding live birth and the conception date of the index birth.