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Table 5 Comparison of accuracy of the new and the Hadlock formulas [36] to estimate birth-weight of the fetus

From: Ultrasound evaluation of the fetal fat tissue, heart, liver and umbilical cord measurements in pregnancies complicated by gestational and type 1 diabetes mellitus: potential application in the fetal birth-weight estimation and prediction of the fetal macrosomia

  GDMG1 (n = 40) GDMG2(n = 40) T1DM (n = 24) Control (n = 40) Total (n = 144)
New formula (AC, AFM, FL)
 APE (%)a 5.8 ± 3.7 7.8 ± 5.6 5.7 ± 4.1* 6.1 ± 4.3 6.4 ± 4.6
 Estimations within 10% of APE 85.0% (34/40)** 67.5% (27/40) 79.2% (19/24) 82.5% (33/40)*** 78.5% (113/144) ***
Hadlock formula (BPD, HC, AC, FL)
 APE (%)a 6.4 ± 5.5 6.8 ± 5.3 9.4 ± 6.7 6.9 ± 4.5 7.2 ± 5.4
 Estimations within 10% of APE 77.5% (31/40) 72.5% (29/40) 62.5% (15/24) 72.5% (29/40) 72.2% (104/144)
  1. Data are expressed as mean ± SD, or as %
  2. GDMG1 diet-controlled gestational diabetes mellitus, GDMG2 insulin-controlled gestational diabetes mellitus, T1DM type 1 diabetes mellitus, BPD biparietal diameter, HC head circumference, AC abdominal circumference, FL femur length, AFM abdominal fat mass
  3. aAPE-absolute percent error = (estimated fetal birth-weight − fetal birth-weight) * 100/fetal birth-weight
  4. *p < .05; **p < .01; *** p< .001 vs. Hadlock formula