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Table 3 Comparison of three antenatal ultrasonography models to predict different birth weight infants

From: Fetal weight estimation by automated three-dimensional limb volume model in late third trimester compared to two-dimensional model: a cross-sectional prospective observational study

Birth weight category

Hadlock

AVol

TVol

BW < 3500 g, n = 31

 MPE (%)

7.0 ± 7.8

- 0.8 ± 6.9

- 2.8 ± 5.9

 EFW within 5% of BW, n (%)

6 (19.4)

18 (58.1)

20 (64.5)

 EFW within 10% of BW, n (%)

22 (71.0)

27 (87.1)

26 (83.9)

BW ≥ 3500 g, n = 25

 MPE (%)

- 1.5 ± 8.1

- 6.4 ± 4.9

- 5.2 ± 6.0

 EFW within 5% of BW, n (%)

13 (52.0)

10 (40.0)

11 (44.0)

 EFW within 10% of BW, n (%)

20 (80.0)

19 (76.0)

20 (80.0)

BW ≤ 2500 g, n = 4

 MPE (%)

5.3 ± 5.1

- 3.2 ± 3.5

- 3.0 ± 3.5

BW ≥ 4000 g, n = 7

 MPE (%)

- 10.6 ± 7.3

- 9.6 ± 3.0

- 9.6 ± 3.7

  1. EFW estimated fetal weight, BW birth weight, MPE mean percentage error, AVol fractional arm volume, TVol fractional thigh volume
  2. Hadlock formula: log10 weight = 1.335–0.0034 AC x FL + 0.0316 BPD + 0.0457 AC + 0.1623 FL. Lee formulas: ln weight = 0.5046 + 1.9665 (ln BPD) − 0.3040 (ln BPD)2 + 0.9675 ln AC + 0.3557 ln AVol; ln weight = − 0.8297 + 4.0344 (ln BPD) − 0.7820 (ln BPD)2 + 0.7853 (ln AC) + 0.0528 (ln TVol)2