Graph 1:. From: Anterior-Posterior Thigh Diameter Measured by Two-Dimensional Sonography.

Graph 3:. From: Anterior-Posterior Thigh Diameter Measured by Two-Dimensional Sonography.

Graph 4:. From: Anterior-Posterior Thigh Diameter Measured by Two-Dimensional Sonography.

*The Residual (Error) Scatter plot – Femur Length from Dr. Hadlock table*

Figure 4:. From: Anterior-Posterior Thigh Diameter Measured by Two-Dimensional Sonography.

Figure 5:. From: Anterior-Posterior Thigh Diameter Measured by Two-Dimensional Sonography.

Figure 3:. From: Anterior-Posterior Thigh Diameter Measured by Two-Dimensional Sonography.

Figure 6:. From: Anterior-Posterior Thigh Diameter Measured by Two-Dimensional Sonography.

Figure 1:. From: Anterior-Posterior Thigh Diameter Measured by Two-Dimensional Sonography.

Figure 2:. From: Anterior-Posterior Thigh Diameter Measured by Two-Dimensional Sonography.

Figure. From: Anterior-Posterior Thigh Diameter Measured by Two-Dimensional Sonography.

*p*less than 0.0001). The anterior-posterior thigh diameter was positively correlated with fetal age [] and [, , & ]. Eleven gestational periods from 18 to 28 weeks were analyzed, each period including 5 different measurements of the femur lengths compared to the fetal age and to the anterior-posterior thigh diameter with mean +/−2SD. Femur length measured from 2.70 centimetre (cm) to 5.50 cm over all gestational periods, the mean being 4.31–4.35. Fetal weight ranged between 310 grams and 1400 grams, the mean being 629 grams. The anterior-posterior thigh diameter (APTD) ranged between 1.80 to 2.87 cm, with the mean at 2.36 cm. Linear growth was obtained in each gestational period from 18 to 28 weeks, and compared favourably with the Dr. Hadlock’s tables., In addition, linear growth of fetal weight was observed. The anterior-posterior thigh diameter, converted to millimetres and compared with the fetal age, was found to be a consistent and valid measurement by using the scatter plots [ & ]. The standard errors of estimates using anterior-posterior thigh diameter (APTD) were significantly lower (at 0.08664) than that using femur length at 0.2436. The variability estimates from Dr. Hadlock et al.’s table for femur length versus fetal age from 18 to 30 weeks have indicated ± 1.8 weeks to 2.4 weeks. The APTD table in this study shows ± 3 days variability. The adjusted R square (variance) was >.99 for both models.

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