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. 2015 Jun 26;10(6):e0131025. doi: 10.1371/journal.pone.0131025

Fig 4. Crude comparison of biases associated with alternative methods of estimating gestational age.

Fig 4

GA: gestational age estimated from CRL biometry. CRL: crown-rump length. SFH: symphysis fundal height. HC: head circumference, measured at 25, 30, 35 or 40 weeks gestation. Solid red vertical lines delineate cut-offs for preterm (<37 weeks) and post-term (>41 weeks) newborns, and small for gestational age (Z-score <-1.28) newborns. Dotted red horizontal lines are mirrors of HC bias to facilitate visual comparison.