Uterine fibroids and risk of preterm birth by clinical subtypes: a prospective cohort study

Table 3 Relationship between fibroid status and preterm birth by subtype, Right from the Start, 2000–2012 (n = 4,622)

Outcome	Preterm	Unadjusted RR	95% CI	Adjusted RR^a	95% CI	Adjusted RR, Secondary^b	95% CI
All preterm births	352	0.99	0.71–1.39	0.88	0.62–1.24	0.93	0.66–1.30
Spontaneous	133	1.35	0.83–2.20	1.27	0.76–2.11	1.29	0.77–2.17
Preterm labor	83	1.19	0.62–2.29	1.31	0.66–2.59	1.43	0.73–2.82
PPROM	50	1.65	0.78–3.49	1.18	0.53–2.62	1.12	0.48–2.58
Medically indicated	78	1.00	0.48–2.06	0.92	0.43–1.96	1.02	0.48–2.18

^a All analyses are from separate models comparing preterm birth (or preterm birth subtype) to 4,270 term births, adjusted for maternal age and race/ethnicity
^b Secondary analysis adjusted for maternal age, race/ethnicity, and history of preterm birth

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