Table 5.

Multivariate analysis: baseline factors associated with increased risk of transfusion

	N case; N control	Case	Control	Odds Ratio (95% CI)
Social work involvement – n (%)	145; 145	34 (23)	8 (6)	4.1 (1.8–10.1)
IV iron supplementation in pregnancy – n (%)	145; 145	22 (15)	3 (2)	3.8 (1.2–17.4)
Unplanned cesarean section – n (%)	145; 145	67 (46)	27 (19)	2.8 (1.3–6.2)
Iron deficiency anemia in pregnancy – n (%)	145; 145	32 (22)	11 (8)	2.0 (0.9–4.6)
Residence in lowest quartile income neighborhood – n (%)	144; 145	44 (31)	26 (18)	1.5 (0.8–2.9)
Highest RDW in pregnancy - median (IQR)	144; 145	14.3 (1.5)	13.9 (1.2)	1.2 (0.9–1.4)
Vaginal delivery – n (%)	145; 145	58 (40)	90 (62)	1.0 (0.5–2.0)

Note: Ethnicity was excluded from multivariate analysis due to small sample size

288 patients were included in the multivariate analysis