TABLE 3.

Blood loss outcomes by latent class assignment among 2322 hospital vaginal births attended by nurse-midwives in the United States, 2012-2017

		Physiologic Class A	Dysfunctional Class B	Preterm Class C	High multiparous Class D
Total blood loss (mL)	Mean ± SD	367.3 ± 258.7	440.5 ± 333.8	350.5 ± 275.8	356.5 ± 293.5
	Coefficient (95% CI)	Reference	73.12 (45.05-101.18)***	−16.82 (−62.45 to 28.81)	−10.85 (−44.13 to 22.43)
≥500 mL PPH	n (%)	178 (17.32)	198 (24.2)	21 (14.4)	54 (16.4)
	OR (95% CI)	Reference	1.52 (1.21-1.91)***	0.80 (0.49-1.31)	0.94 (0.67-1.31)
≥1000 mL PPH	n (%)	37 (3.6)	47 (5.7)	5 (3.4)	17 (5.2)
	OR (95% CI)	Reference	1.63 (1.05-2.53)*	0.95 (0.37-2.46)	1.46 (0.81-2.63)
Blood transfusion	n (%)	13 (1.3)	22 (2.7)	2 (1.4)	5 (1.5)
	OR (95% CI)	Reference	2.16 (1.08, 4.30)*	1.08 (0.24, 4.85)	1.20 (0.43-3.41)

^*P < 0.05,

^**P < 0.01,

^***P < 0.001.