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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Obstet Gynecol. 2015 Nov;126(5):954–961. doi: 10.1097/AOG.0000000000001095

Table 6.

Multivariable Poisson regression model for relative risk of pregnancy prolongation for ≥48 hours after admission.

Variable Unadjusted RR
(95% CI)
P-
value
Adjusted RR (95%
CI)
p-value

Admission gestational age, per one week increase 0.87 (0.81 – 0.95) 0.001 0.89 (0.82 – 0.96) 0.003

Received tocolysis 3.02 (1.26 – 7.24) 0.013 2.64 (1.05 – 6.62) 0.038

Caucasian race 0.66 (0.42 – 1.04) 0.070 0.68 (0.43 – 1.08) 0.102

Cervical dilation at presentation
  4 centimeters referent referent
  5 centimeters 0.65 (0.37 – 1.15) 0.137 0.61 (0.35 – 1.06) 0.081
  6 centimeters 0.42 (0.19 – 0.95) 0.037 0.48 (0.22 – 1.05) 0.066
  7 centimeters 0.59 (0.27 – 1.30) 0.191 0.74 (0.35 – 1.59) 0.445
*

Potential confounders dropped from the final model (p>0.20) included: maternal body mass index, nulliparity, and chorioamnionitis.