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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: J Perinatol. 2012 Mar 29;32(7):483–490. doi: 10.1038/jp.2011.193

Figure 1.

Figure 1

Predicted probabilities of preterm birth as a function of interleukin-1 receptor antagonist (IL-1Ra) and IL-6. Predicted results in the figure are based on a model in which we dichotomized IL-6, to estimate the standard error of the difference for points on a continuous variable. IL-6 was dichotomized at the 80th percentile, which was representative of the point on the IL-6 continuum where significant differences emerged. Predicted probabilities are generated from the logistic regression model. Error bars represent half of a confidence interval (CI) on each line so that non-overlapping bars represent significant differences.