Table 4.
Univariate analysis: factors associated with increased risk of transfusion and maternofetal outcomes
| N case; N control | Case | Control | Odds Ratio (95% CI) | |
|---|---|---|---|---|
| Baseline characteristics | ||||
| IV iron supplementation in pregnancy – n (%) | 145; 145 | 22 (15) | 3 (2) | 7.4 (2.6–28.3) |
| Social work involvement – n (%) | 145; 145 | 34 (23) | 8 (6) | 5.0 (2.4–11.7) |
| Unplanned cesarean section – n (%) | 145; 145 | 67 (46) | 27 (19) | 3.7 (2.2–6.4) |
| Iron deficiency anemia in pregnancy – n (%) | 145; 145 | 32 (22) | 11 (8) | 3.3 (1.7–7.1) |
| Residence in lowest quartile income neighborhood – n (%) | 144; 145 | 44 (31) | 26 (18) | 2.0 (1.2–3.5) |
| Highest RDW in pregnancy - median (IQR) | 144; 145 | 14.3 (1.5) | 13.9 (1.2) | 1.3 (1.1–1.5) |
| Caucasian – n (%) | 55; 90 | 13 (24) | 42 (47) | 0.4 (0.2–0.7) |
| Vaginal delivery – n (%) | 145; 145 | 58 (40) | 90 (62) | 0.4 (0.3–0.7) |
| Twins/triplets – n (%) | 145; 145 | 12 (8) | 6 (4) | 2.0 (0.8–5.7) |
| Pre-conception iron deficiency – n (%) | 85; 41 | 27 (32) | 9 (22) | 1.5 (0.7–3.7) |
| Planned cesarean section – n (%) | 145; 145 | 20 (14) | 28 (19) | 0.7 (0.4–1.3) |
| Outcomes | ||||
| Primary postpartum hemorrhage – n (%) | 145; 145 | 94 (65) | 4 (3) | 65.0 (22.7–185.8) |
| Maternal bacterial infection – n (%) | 145; 145 | 22 (15) | 1 (1) | 25.8 (3.4–193.8) |
| Fetal demise – n (%) | 145; 145 | 17 (12) | 2 (1) | 9.5 (2.2–41.9) |
| Prematurity (< 37 weeks) – n (%) | 145; 145 | 68 (47) | 14 (10) | 8.3 (4.4–15.7) |
| Low birth weight (< 2500 g) – n (%) | 145; 145 | 64 (44) | 15 (10) | 6.8 (3.6–12.8) |
| NICU admission – n (%) | 145; 145 | 51 (35) | 13 (9) | 5.5 (2.8–10.7) |
| Maternal ICU admission – n (%) | 145; 145 | 19 (13) | 0 (0) | NA |
| Hysterectomy – n (%) | 145; 145 | 13 (9) | 0 (0) | NA |
ICU intensive care unit, NA not available, NICU neonatal intensive care unit, IQR interquartile range