Table 5.
Test characteristics for predicting SGA5
| Cut-off point* | Relative Risk (95%CI) | Sensitivity (95%CI) | Specificity (95%CI) | PPV (95%CI) | NPV (95%CI) | |
|---|---|---|---|---|---|---|
| PV, cc | ≤51.0 | 3.0 (1.5–6.2) | 46.4% (28.0–65.8) | 79.1% (75.4–82.4) | 10.1% (5.7–17.1) | 96.7% (94.4–98.1) |
| PQ | ≤0.59 | 3.2 (1.6–6.6) | 46.4% (28.0–65.8) | 80.0% (76.4–83.2) | 10.6% (6.0–17.7) | 96.7% (94.5–98.1) |
| MPD, cm | ≤10.0 | 2.6 (1.3–5.4) | 39.3% (22.1–59.3) | 81.1% (77.5–84.2) | 9.6% (5.1–16.8) | 96.3% (94.1–97.8) |
| PMI | ≥17.7 | 3.7 (1.8–7.6) | 50.0% (31.1–68.9) | 80.2% (76.6–83.4) | 11.4% (6.6–18.7) | 96.9% (94.8–98.2) |
| MCD, cm | ≤7.40 | 3.3 (1.6–6.8) | 46.4% (28.0–65.8) | 80.5% (76.5–83.7) | 10.8% (6.1–18.1) | 96.7% (94.5–98.0) |
| Mean PI | ≥1.9 | 1.6 (0.7–3.5) | 28.6% (14.0–48.9) | 80.0% (76.4–83.2) | 6.8% (3.2–13.3) | 95.7% (93.3–97.3) |
SGA5- birthweight <5th%ile; PPV- positive predictive value, NPV-negative predictive value; PV- placental volume; PQ- placental quotient; MPD- mean placental diameter; PMI- placental morphology index (MPD/PQ); MCD- mean chorionic diameter; PI- pulsatility index (uterine artery Doppler)
*
Cut-off point refers to the value of the for the ultrasound parameter below or above which the screening test deemed positive or negative.