Table 1 Baseline demographics and clinical characteristics
From: Obstetric blood transfusion in placenta previa patients with prenatal anemia: a retrospective study
Characteristics | Total (n = 749) | Anemia (n = 391) | Normal (n = 358) | P value |
|---|---|---|---|---|
Maternal age, mean ± SD, years | 31.36 ± 4.64 | 31.02 ± 4.72 | 31.72 ± 4.53 | 0.041 |
Regiona | < 0.001 | |||
Rural | 495 | 281 (56.77%) | 214 (43.23%) | |
Urban | 253 | 110 (43.48%) | 143 (56.52%) | |
Unknown | 1 | 0 | 1 (0.28%) | |
Occupation | 0.019 | |||
No | 513 (68.49%) | 283 (72.38%) | 230 (64.25%) | |
Yes | 235 (31.38%) | 108 (27.62%) | 127 (35.47%) | |
Unknown | 1 (0.13%) | 0 | 1 (0.28%) | |
Body mass index, kg/m2 | 28.49 ± 3.92 | 28.23 ± 4.05 | 28.76 ± 3.76 | 0.067 |
Pregnancy complications | 217 (28.97%) | 103 (26.34%) | 114 (31.84%) | 0.097 |
Gestational age at delivery, weeks | 35.33 ± 2.30 | 35.06 ± 2.41 | 35.62 ± 2.14 | 0.806 |
Gravidity | 0.023 | |||
2 | 203 (27.10%) | 93 (23.79%) | 110 (30.73%) | |
3 | 193 (25.77%) | 115 (29.41%) | 78 (21.79%) | |
≥ 4 | 353 (47.13%) | 183 (46.80%) | 170 (47.49%) | |
Parity | 0.051 | |||
0 | 75 (10.01%) | 31 (7.93%) | 44 (12.29%) | |
1 | 480 (64.09%) | 245 (62.66%) | 235 (65.64%) | |
2 | 166 (22.16%) | 99 (25.32%) | 67 (18.72%) | |
≥ 3 | 28 (3.74%) | 16 (4.09%) | 12 (3.35%) | |
Previous caesarean section | 600 (80.11%) | 327 (83.63%) | 273 (76.26%) | 0.012 |
Previous vaginal delivery | 114 (15.22%) | 55 (14.07%) | 59 (16.48%) | 0.358 |
Uterine anomalies | 479 (63.95%) | 258 (65.98%) | 221 (61.73%) | 0.226 |
Assisted reproduction technology | 34 (4.54%) | 18 (4.60%) | 16 (4.47%) | 0.930 |
Emergency surgery | 179 (23.90%) | 100 (25.58%) | 79 (22.07%) | 0.261 |
Hemorrhage during pregnancy | 468 (62.48%) | 250 (63.94%) | 218 (60.89%) | 0.390 |
Multiple pregnancy | 21 (2.80%) | 15 (3.84%) | 6 (1.68%) | 0.074 |
Placental location | 0.012 | |||
Posterior | 166 (22.16%) | 74 (9.88%) | 92 (25.70%) | |
Lateral | 49 (6.54%) | 19 (2.54%) | 30 (8.38%) | |
Anterior | 131 (17.49%) | 69 (17.65%) | 62 (17.32%) | |
Central | 399 (53.27%) | 227 (58.06%) | 172 (48.04%) | |
Unknown | 4 (0.53%) | 2 (0.51%) | 2 (0.26%) | |
Placenta previa types | 0.013 | |||
Low-lying | 10 (1.34%) | 4 (1.02%) | 6 (1.68%) | |
Marginal | 111 (14.82%) | 43 (11.00%) | 68 (18.99%) | |
Partial | 61 (8.14%) | 36 (9.21%) | 25 (6.98%) | |
Central | 567 (75.70%) | 308 (78.77%) | 259 (72.35%) | |
Placenta accrete spectrum | 693 (93.02%) | 366 (94.09%) | 327 (91.85%) | 0.232 |
Fetal presentation | 0.630 | |||
Cephalic | 599 (80.08%) | 318 (81.33%) | 281 (78.71%) | |
Breech | 98 (13.10%) | 47 (12.02%) | 51 (14.29%) | |
Shoulder | 51 (6.82%) | 26 (6.65%) | 25 (7.00%) | |
Unknown | 1 (0.13%) | 0 | 1 (0.28%) | |
Prenatal hemoglobin, g/dL | 10.87 ± 1.37 | 9.82 ± 0.85 | 12.01 ± 0.82 | < 0.001 |