Figure 2. Fetal biparietal diameter measurements in Burmese and Karen pregnant women with and without malaria.

The x-axis shows the gestational age (GA) in weeks, based on first trimester dated pregnancies on the Thai-Burmese border from 2001 to 2010. The y-axis depicts the fetal biparietal diameter measurement (BPD) in centimeters. The fetal BPD in pregnant women with malaria (red diamonds, n = 336) and in women without malaria (+, n = 3,443) between 16 and 24 GA weeks were superimposed on the 2.5^th, 50^th and 97.5^th centiles of a reference equation for this population [29]. Note that the majority of fetal BPD measurements in malaria infected women lie below the 50^th centile in both the main figure (16 to 24 GA weeks) and in the inset (17 to 20 GA weeks, where 90% (302/336) of the measurements in malaria infected women were obtained).