Table 3. Diagnostic performance of fetal biometric parameters for the prediction of small for gestational age according to the gestational age ranges.

	Gestational age (weeks)	AUC (95% CI)	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
BPD	24+0–28+6	0.727 (0.664–0.786)	82.1	55.8	35.0	91.5
	29+0–32+6	0.701 (0.64–0.764)	76.8	58.3	36.7	88.8
	33+0–35+6	0.708 (0.647–0.762)	44.2	86.4	52.3	82.2
HC	24+0–28+6	0.697 (0.631–0.753)	80.8	50.2	32.0	90.0
	29+0–32+6	0.681 (0.613–0.741)	62.6	68.8	38.8	85.4
	33+0–35+6	0.675 (0.61–0.732)	49.0	76.7	41.5	81.7
AC	24+0–28+6	0.806 (0.756–0.856)	79.5	71.7	44.9	92.3
	29+0–32+6	0.804 (0.75–0.851)	79.8	69.4	45.1	91.6
	33+0–35+6	0.805 (0.756–0.848)	64.4	83.5	56.8	87.5
FL	24+0–28+6	0.651 (0.585–0.712)	74.4	53.9	31.9	87.9
	29+0–32+6	0.683 (0.624–0.745)	79.8	52.2	34.5	89.1
	33+0–35+6	0.687 (0.63–0.743)	49.0	77.0	41.8	81.8
EFW	24+0–28+6	0.775 (0.718–0.828)	74.4	70.3	42.0	90.4
	29+0–32+6	0.807 (0.754–0.854)	74.7	73.9	47.4	90.3
	33+0–35+6	0.826 (0.778–0.872)	60.6	87.6	61.2	86.8

AUC, area under the curve; CI, confidence interval; PPV, positive predictive value; NPV, negative predictive value; BPD, biparietal diameter; HC, head circumference; AC, abdominal circumference; FL, femur length; EBW, estimated fetal weight