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. Author manuscript; available in PMC: 2014 Sep 4.
Published in final edited form as: Am J Reprod Immunol. 2013 Aug;70(2):162–175. doi: 10.1111/aji.12141

Figure 2. Illustration of effect modification between parity and case status over time.

Figure 2

The likelihood of a HLA PRA class I > 10% elevating among women with spontaneous preterm delivery compared to women with normal term delivery over time differed significantly by parity in multiparous women with spontaneous preterm delivery, exhibiting the greatest risk relative to nulliparous women over time. TD, normal term delivery; sPTD, spontaneous preterm delivery; OR, odds ratio.