Table 3 Accuracy analyses to predict SGA newborns, in this analysis prediction accuracy was stratified for gestational age at ultrasound examination. P-value refers to DeLong’s test. (AC, abdominal circumference measurement stratified according to Papageorghiou et al. [15]; EFW postnatal standard, estimated fetal weight calculated with the formula proposed by Stirnemann et al. [11] and stratified according to the standard reported by Villar et al. [12, 16]; EFW prenatal standard IG-21, estimated fetal weight calculated with the formula proposed by Stirnemann et al. [11] and stratified according to the standard reported by Stirnemann et al. [11]; EFW prenatal standard Hadlock, estimated fetal weight calculated with the formula proposed by Hadlock et al. [18] and stratified according to the standard reported by Hadlock et al. [19])
Birthweight centile (gestational age) | Variable | Area under ROC curve % (95% CI) | p value | ||
|---|---|---|---|---|---|
AC | EFW postnatal standard | EFW prenatal standard IG-21 | |||
< 10th (24–27 wks) | AC | 86.91 (79.91–93.91) | – | ||
EFW postnatal standard | 89.4 (82.94–95.8) | 0.970 | – | ||
EFW prenatal standard IG-21 | 88.15(81.56–94.7) | 0.191 | 0.312 | – | |
EFW prenatal standard Hadlock | 89.7 (C 83.46–95.9) | 0.127 | < 0.05 | 0.262 | |
< 3rd (24–27 wks) | AC | 90.7 (81.09–100) | – | ||
EFW postnatal standard | 90.98 (C 80.17–100) | 0.829 | – | ||
EFW prenatal standard IG-21 | 92.09 (82.41–100) | 0.256 | 0.319 | – | |
EFW prenatal standard Hadlock | 91.86% (81.5–100) | 0.489 | 0.426 | 0.829 | |
< 10th (28–33 wks) | AC | 85.14 (81.52–88.75) | – | ||
EFW postnatal standard | 87.13 (83.87–90.38) | 0.257 | – | ||
EFW prenatal standard IG-21 | 87.13 (83.87–90.38) | < 0.05 | < 0.05 | – | |
EFW prenatal standard Hadlock | 88.68 (85.66–91.69) | < 0.05 | < 0.05 | < 0.05 | |
< 3rd (28–33 wks) | AC | 89.87 (85.99–93.75) | – | ||
EFW postnatal standard | 89.08 (84.77–93.39) | 0.350 | – | ||
EFW prenatal standard IG-21 | 90.92 (87.13–94.72) | 0.077 | < 0.05 | – | |
EFW prenatal standard Hadlock | 90.67 (86.81–94.53) | 0.447 | 0.173 | 0.769 | |
< 10th (34–36 wks) | AC | 84.49 (80.33–88.64) | – | ||
EFW postnatal standard | 85.11 (81.18–89.04) | 0.362 | – | ||
EFW prenatal standard IG-21 | 85.5 (81.6–89.46) | 0.082 | 0.363 | – | |
EFW prenatal standard Hadlock | 84.75 (80.62–88.88) | 0.841 | 0.763 | 0.449 | |
< 3rd (34–36 wks) | AC | 84.49(80.33–88.64) | – | ||
EFW postnatal standard | 85.11 (81.18–89.04) | 0.751 | – | ||
EFW prenatal standard IG-21 | 85.53 (81.6–89.46) | 0.372 | 0.322 | – | |
EFW prenatal standard Hadlock | 84.75 (80.62–88.88) | 0.828 | 0.711 | 0.795 | |