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. Author manuscript; available in PMC: 2014 Nov 13.
Published in final edited form as: Ultrasound Med Biol. 2010 Jan;36(1):29–37. doi: 10.1016/j.ultrasmedbio.2009.09.004

Figure 5.

Figure 5

This scatter plot depicts the relationship between middle cerebral artery (MCA) pulsatility index (PI) Z-score and head circumference Z-score prior to intervention, and also reflects the lack of association between head circumference and other MCA flow indices. The relationship is defined by the following regression equation: Head circumference Z-score = (−0.189 × MCA PI Z-score) − 0.189 (r = −0.17, p = 0.27). The solid line at Z = 0 indicates the mean for the normal population, and the dashed lines at +2 and −2 indicate the limits of the normal range.