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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Ultrasound Med Biol. 2015 Aug 8;41(11):3023–3029. doi: 10.1016/j.ultrasmedbio.2015.06.014

Figure 4.

Figure 4

Figure 4

a. Attenuation coefficient over the course of pregnancy for 61 African-American women by birth outcome and 17-OHPC. The medically indicated preterm birth group (n = 6) was not included. Error bars are SEM. 17-OHPC = 17 hydroxyprogesterone caproate.

Figure 4.b. Cervical length over the course of pregnancy for 6 African-American women by birth outcome and 17-OHPC. The medically indicated preterm birth group (n = 6) was not included. Error bars are SEM. 17-OHPC = 17 hydroxyprogesterone caproate.