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. Author manuscript; available in PMC: 2020 Mar 6.
Published in final edited form as: Am J Perinatol. 2019 Sep 17;37(4):357–364. doi: 10.1055/s-0039-1696641

Table 2.

Multivariable logistic regression of factors associated with preterm birth <37 weeks at the time of hospitalization for spontaneous late preterm labor

Characteristic/risk factor Crude odds ratioa Adjusted odds ratiob 95% confidence intervalc p-Value
≥4-cm dilation at randomization 3.5 3.5 2.5–4.8 <0.001
≥75% effacement at randomization 2.1 2.2 1.6–3.0 <0.001
Gestational age at randomization (per completed week) 0.8 0.8 0.6–1.0 0.02
Nulliparity 1.6 1.7 1.1 −2.6 0.01
Fetal malpresentation 6.1 6.5 0.8–53.6 0.08
a

Initial multivariable model controlled for gestational age at randomization (per completed week), nulliparity, history of a prior preterm birth, antepartum infections, ≥4-cm dilation at randomization, ≥75% effacement at randomization, and fetal malpresentation.

b

Final model adjusted for ≥4-cm dilation at randomization, ≥75% effacement at randomization, gestational age at randomization (per completed week), nulliparity, and fetal malpresentation.

c

Confidence interval for the adjusted odds ratio.