Table 2.

Associations of predictors of interest with early pregnancy loss treatment success.

	RR	aRR	95% CI
Timing interval
0–6 hours	0.56	0.58	0.40–0.85
7–20 hours	Ref. group	-
21–48 hours	0.91	0.85	0.72–0.99
Race
Non-Black	Ref. group	-
Black	0.92	1.03	0.89–1.20
Gestational age
<7 wk	Ref. group	-
7–8 wk 6 d	0.99	1.08	0.93–1.25
9–12 wk 6 d	0.93	1.03	0.86–1.23
Diagnosis
Embryonic/fetal demise	Ref. group	-
Anembryonic gestation	0.94	0.99	0.84–1.18
Bleeding at presentation
No	Ref. group	-
Yes	1.06	1.01	0.82–1.24
Insurance
Nonprivate	Ref. group	-
Private	1.14	1.09	0.90–1.32
Enrollment site
University of Pennsylvania	Ref. group	-
University of California, Davis	1.15	1.14	0.92–1.40
Montefiore Hospital and Albert Einstein College of Medicine	1.04	1.05	0.84–1.30

aRR, adjusted risk ratio from multivariable estimated from a generalized linear model with a log link and robust Poisson error variance; Ref. group, reference group; RR, risk ratio.