Table 3.
Test characteristics for predicting SGA10
| Cut-off point* | Relative Risk (95%CI) | Sensitivity (95%CI) | Specificity (95%CI) | PPV (95%CI) | NPV (95%CI) | |
|---|---|---|---|---|---|---|
| PV, cc | ≤51.0 | 2.6 (1.6–4.3) | 42.9% (30.0–56.7) | 80.1% (76.3–83.4) | 18.8% (12.6–26.8) | 92.9% (90.0–95.0) |
| PQ | ≤0.59 | 2.6 (1.6–4.2) | 41.1% (28.4–55.0) | 80.8% (77.1–84.1) | 18.7% (12.5–26.9) | 92.7% (89.9–94.9) |
| MPD, cm | ≤10.0 | 1.8 (1.0–3.0) | 30.4% (19.2–44.3) | 81.2% (77.6–84.4) | 14.8% (9.1–22.9) | 91.6% (88.6–93.9) |
| PMI | ≥17.4 | 3.3 (2.0–5.3) | 50.0% (36.5–63.5) | 79.5% (75.7–82.8) | 20.7% (14.4–28.7) | 93.7% (90.9–95.7) |
| MCD, cm | ≤7.5 | 2.5 (1.6–4.2) | 42.9% (30.0–56.7) | 79.3% (75.5–82.7) | 18.2% (12.2–26.0) | 92.8% (89.9–95.0) |
| Mean PI | ≥1.88 | 1.9 (1.2–3.2) | 35.7% (23.7–49.7) | 80.0% (76.3–83.3) | 16.3% (10.4–24.2) | 92.0% (89.0–94.2) |
SGA10- birthweight <10th%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 ultrasound parameter below or above which the screening test was deemed positive.