Table 2 Classification results of different gestational weeks and different planes
Gestational age | Sonographic planes | Accuracy,% (95%CI) | Sensitivity,% (95%CI) | Specificity,% (95%CI) | PPV,% (95%CI) | NPV,% (95%CI) | AUC (95%CI) |
|---|---|---|---|---|---|---|---|
sixth week | Tran | 83.07 (78.10, 93.40) | 82.30 (72.45, 95.34) | 83.89 (73.74, 94.04) | 84.08 (72.83, 95.34) | 81.87 (71.08, 92.67) | 0.863 (0.737, 0.922) |
Sag | 82.59 (74.16, 94.76) | 82.39 (68.60, 98.10) | 82.79 (71.90, 94.90) | 82.96 (67.94, 97.97) | 82.29 (72.05, 92.53) | 0.849 (0.716, 0.935) | |
Tran+ Sag | 86.53 (83.11, 97.83) | 88.71 (79.80, 97.99) | 83.57 (73.66, 94.08) | 81.07 (70.61, 91.53) | 88.85 (78.50, 99.19) | 0.904 (0.781, 0.950) | |
seventh week | Tran | 76.94 (76.08, 89.17) | 72.44 (65.19, 80.16) | 80.94 (71.14, 91.54) | 83.96 (73.46, 94.47) | 68.05 (55.67, 94.47) | 0.827 (0.706, 0.833) |
Sag | 78.52 (76.88, 88.62) | 76.62 (69.34, 84.53) | 81.42 (72.99, 90.67) | 82.93 (72.30, 93.55) | 74.73 (63.17, 86.28) | 0.829 (0.733, 0.838) | |
Tran+ Sag | 78.35 (76.19, 91.90) | 77.96 (64.83, 91.90) | 78.87 (69.46, 89.49) | 79.26 (65.54, 92.99) | 77.61 (67.90, 87.33) | 0.832 (0.702, 0.865) | |
eighth week | Tran | 82.21 (72.72–99.02) | 83.22 (69.80, 96.40) | 77.08 (59.96, 96.35) | 74.60 (61.93, 87.26) | 84.89 (72.51, 97.28) | 0.855 (0.706, 0.938) |
Sag | 81.15 (71.03–95.58) | 81.38 (68.58, 94.04) | 79.40 (62.58, 97.04) | 77.94 (66.58, 89.31) | 82.02 (68.95, 95.09) | 0.838 (0.694, 0.929) | |
Tran+ Sag | 77.88 (77.14–95.19) | 77.55 (72.13, 95.19) | 82.94 (75.59, 93.01) | 84.48 (74.75, 94.22) | 75.56 (67.66, 83.46) | 0.858 (0.729, 0.829) | |
Overall | Tran | 79.34 (73.44, 85.25) | 77.06 (67.42, 86.70) | 81.05 (73.89, 88.21) | 82.22 (77.63, 86.82) | 74.82 (59.65, 89.99) | 0.843 (0.801, 0.884) |
Sag | 80.07 (75.49, 84.66) | 79.18 (72.63, 85.72) | 81.36 (75.13, 87.60) | 81.85 (77.82, 85.88) | 78.21 (69.03, 87.38) | 0.834 (0.776, 0.893) | |
Tran+ Sag | 80.32 (72.38, 88.25) | 80.73 (69.16, 92.30) | 80.91 (76.75, 85.08) | 81.18 (79.10, 83.26) | 80.02 (66.37, 93.68) | 0.857 (0.793, 0.922) |