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. Author manuscript; available in PMC: 2010 Nov 22.
Published in final edited form as: Am J Obstet Gynecol. 2010 Jun 12;203(2):138.e1–138.e8. doi: 10.1016/j.ajog.2010.05.006

Figure. Observed and expected distributions of birth head circumference Z-scores.

Figure

Vertical bars represent narrow groupings of head circumference Z-scores in extremely low gestational age newborns study sample. Expected normal distribution of Z-scores (red line; mean = 0, SD = 1) is overlaid.

McElrath. Factors associated with small head circumference at birth among ELGAN. Am J Obstet Gynecol 2010.