Table 2 Diagnostic accuracy of elastography performed at 18-22 weeks of pregnancy in predicting preterm delivery for various cut off colors: red (soft); yellow and red (soft and medium soft) and red, yellow and blue (soft, medium soft and medium hard)
Internal os elastography assessment | |||
|---|---|---|---|
Red | Yellow and red | Blue, yellow and red | |
Sensivity (95% CI) | 68.6% (50.7-83.1) | 85.7% (69.7-95.2) | 91.4% (76.9-98.1) |
Specifity (95% CI) | 99.0% (97.1-96.4) | 97.6% (95.2-99.0) | 76.2% (70,9-80.9) |
NPV (95% CI) | 96.4% (93.6-98.2) | 98.3% (96.1-99.4) | 98.7% (96.2-99.7) |
PPV (95% CI) | 88.9% (70.8-97.6) | 81.1% (64.8-92.0) | 31.1% (22.3-40.9) |
LR + (95% CI) | 68.1 (21.6-214.7) | 36.5 (17.3-76.8) | 3.8 (3.0-4.8) |
LR- (95% CI) | 0.32 (0.19-0.52) | 0.15 (0.06-0.33) | 0.11 (0.04-0.33) |