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Table 1 Distribution of peripartum variables and differences associated with peripartum blood transfusion

From: Predicting peripartum blood transfusion: focusing on pre-pregnancy characteristics

  No transfusion
1,943,258 (98.14%)
Transfusion
36,868 (1.86%)
p-value
Maternal age (years) mean ± SD 31.16 ± 3.86 32.14 ± 4.26 <  0.001
Maternal age ≥ 35 years, N (%) 349,119 (17.97%) 10,177 (27.60%) <  0.001
Multifetal pregnancy, N (%) 27,331 (1.41%) 2761 (7.49%) <  0.001
Nulliparity, N (%) 927,079 (47.74%) 15,968 (43.31%) <  0.001
Cesarean delivery, N (%) 713,992 (36.74%) 21,388 (58.01%) <  0.001
Gestational age at births < 37 weeks, N (%) 56,826 (2.92%) 5243 (14.22%) <  0.001
Neonatal weight (kg) mean ± SD 3.19 ± 0.47 3.03 ± 0.67 <  0.001
 2.5–4.0 kg, N (%) 1,793,764 (92.31%) 29,503 (80.02%) <  0.001
 < 2.5 kg, N (%) 80,842 (4.16%) 5743 (15.58%)  
 ≥ 4.0 kg, N (%) 68,652 (3.53%) 1622 (4.40%)  
Neonatal sex (male), N (%) 996,211 (51.26%) 18,111 (49.12%) <  0.001
Hypertension, N (%) 35,335 (1.82%) 2561 (6.95%) <  0.001
Postpartum hemorrhage, N (%) 150,259 (7.73%) 16,072 (43.59%) <  0.001
Placental abruption, N (%) 5925 (0.30%) 1033 (2.80%) <  0.001
Placenta previa, N (%) 17,391 (0.89%) 5479 (14.86%) <  0.001
Embolization, N (%) 151 (0.01%) 2450 (6.65%) <  0.001
Hysterectomy, N (%) 229 (0.01%) 1569 (4.26%) <  0.001