Forty-eight females during the ten–sixteen done months of pregnancy was hired. The new suggest and you may important departure of its age, gravidity and parity had been thirty two.2±cuatro.three-years, dos.3±step 1.5 and you will 0.7±0.eight, correspondingly.

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 Thailand Dating-Seiten 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.

## Notes: The brand new Florida/Ac proportion grows towards the GA when you look at the an enthusiastic inverse relationships

Figure 3 The graph of fetal BPD against the FT.Notes: The fetal BPD showed a positive linear relationship with fetal FT. The regression equation is as follows: BPD (mm) =1.243? FT (mm) +7.539. Adjusted R 2 =0.945, R=0.97, P<0.001.Abbreviations: BPD, biparietal diameter; FT, foot length.

Figure 4 The graph of fetal HC against the FT. The regression equation is as follows: HC (mm) =4.407? FT (mm) +. Adjusted R 2 =0.95, R=0.97, P<0.001.Abbreviations: FT, foot length; HC, head circumference.

## Notes: The latest fetal HC exhibited an optimistic linear reference to fetal Ft

Figure 5 The graph of fetal AC against the FT.Notes: The fetal AC showed a positive linear relationship with fetal FT. The regression equation is as follows: AC (mm) =3.835? FT (mm) +. Adjusted R 2 =0.943, R=0.97, P<0.001.Abbreviations: AC, abdominal circumference; FT, foot length.

Figure 6 The graph of fetal FL against the FT.Notes: The fetal FL showed a positive linear relationship with fetal FT. The regression equation is as follows: FL (mm) =1.029? FT (mm) ?3.807. Adjusted R 2 =0.937, R=0.97, P<0.001.Abbreviations: FL, femur length; FT, foot length.

Figure 7 The graph of the fetal CRL against the fetal FT.Notes: The fetal CRL showed a positive linear relationship with fetal FT. The regression equation is as follows: CRL (mm) =4.291? FT (mm) +. Adjusted R 2 =0.798, R=0.89, P<0.001.Abbreviations: CRL, crown rump length; FT, foot length.

Figure 8 The fetal FL/FT ratio against the FT.Notes: The FL/FT ratio increases in an inverse relationship with the FT. The ratio approaches 0.9 when the FL is around 25 mm. R 2 =0.49, R=0.7, P<0.001.Abbreviations: FL, femur length; FT, foot length.

Figure 9 The graph of FL/FT ratio against the estimated GA.Notes: The FL/FT ratio increases with the estimated GA in an inverse relationship and reaches 0.9 at 17 weeks gestation. R 2 =0.516, R=0.72, P<0.001.Abbreviations: FL, femur length; FT, foot length; GA, gestational age.

Figure 10 The FL/AC ratio against the GA. The ratio reaches 0.16 beyond 15 weeks gestation. R 2 =0.704, R=0.84, P<0.001.Abbreviations: AC, abdominal circumference; FL, femur length; GA, gestational age.

Table 1 New linear regression models predicting fetal parameters using the foot-length due to the fact predictor variableNote: The fetal variables was mentioned from inside the millimeters in addition to projected gestational many years from inside the days.

The fetal FT showed a linear correlation with GA, BPD, HC, AC, FL and CRL between 10 and 16 weeks gestation (P<0.001; Figures 2–7). The correlation was the highest with HC, with the adjusted R 2 being 0.950, followed by BPD (0.945), AC (0.943), FL (0.937), GA (0.816) and was the least with CRL (0.798; Table 1). This is consistent with the histologic findings that the fetal FT bears a linear relationship with the GA, even at an earlier gestation. 15 As fetal FT is noted to be independent of gender, environmental tobacco smoke, maternal smoking and alcohol consumption in human abortus up to 69 days postconception 15 (or below 12 weeks by last normal menstrual period), it could be used to estimate the fetal GA, even at an early gestation, as observed in previous studies. 1,2,8

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