TABLE 5.

Post hoc tests: role of modified AMTSL by latent class assignment and effect of active management on prolonged third stage length among 2322 hospital vaginal births attended by nurse-midwives in the United States, 2012-2017

	Class	≥500 mL PPH OR (95% CI)	≥1000 mL PPH OR (95% CI)	Blood transfusion OR (95% CI)	Third stage labor ≥30 min
Main effects	Physiologic: A	Reference	Reference	Reference	Reference
Class	Dysfunctional: B	1.48 (0.99-2.19)	1.70 (0.75-3.89)	1.08 (0.25-4.66)	1.55 (0.61-3.89)
	Preterm: C	0.72 (0.31-1.67)	0.67 (0.08-5.28)	1.38 (0.29-6.65)	2.40 (1.02-5.65)*
	Multiparous: D	0.53 (0.28-1.03)	1.23 (0.39-3.92)	0.78 (0.09-6.86)	1.23 (0.34-4.47)
AMTSL	(if Class A)	4.53 (2.95-6.93)***	6.20 (2.36-16.27)***	3.12 (0.76-12.71)	2.37 (1.12-4.99)*
Modified AMSTL	(overall effect)	4.84 (3.23-7.26)***	4.29 (1.72-10.74)**	2.34 (0.57-9.61)	Not included

^*P < 0.05,

^**P < 0.01,

^***P < 0.0001.

OR, odds ratio.