. 2010 Sep 23;34(1):39–43. doi: 10.2337/dc10-0415

Table 3.

Ability of an abdominal circumference measurement <90th percentile to predict a normally grown neonate depending on the gestational age at performance of the scan and the absence or presence of maternal risk factors for LGA birth weight

Gestational age at abdominal circumference <90th percentile	Non-LGA birth weight (%)
Gestational age at abdominal circumference <90th percentile	Total population	No maternal risk factor	With maternal risk factor
All U.S. (= never abdominal circumference >90th percentile)	88.9	92.2	83.2^*
24–27 weeks (n = 313)	85.9	90.0	81.8^*
28–31 weeks (n = 663)	86.9	89.5	79.7^*
32–35 weeks (n = 817)	87.9	92.5	81.6^*
36–39 weeks (n = 703)	89.8	93.7	81.0^*
In both, 24–27 and 28–31 weeks (n = 280)	88.0	92.5	84.0^*

*Significantly different from percentage in pregnancies without maternal risk factors.