Forty-7 females at 10–sixteen finished days of being pregnant had been hired. The brand new imply and you will standard departure of their ages, gravidity and you will parity have been thirty-two.2±cuatro.3 years, dos.3±step one.5 and you can 0.7±0.7, respectively.
The fetal FT (mm) is plotted against the GA (weeks), as shown in Figure 2. The BPD, HC, AC, FL and CRL (mm) are plotted against FT in Figures 3–7, respectively. 001). The graphs of fetal FL to FT ratio against the FT and the GA are shown in Figures 8 and 9, respectively. The graph of the ratio of FL to AC against the GA is shown in Figure 10. The regression models for Figures 2–7 are shown within the legend for each figure and are summarized in Table 1. The Pearson coefficient is 0.992 for intraobserver correlation (P<0.001) and 0.990 for interobserver correlation (P<0.001) in the measurement of fetal FT.
Figure 2 The graph of the estimated GA against the fetal FT.Notes: The estimated GA showed a positive linear relationship with fetal FT. The regression equation is as follows: GA (weeks) =0.335? FT (mm) +8.845. Adjusted R 2 =0.816, R=0.90, P<0.001.Abbreviations: FT, foot length; GA, gestational age.