Table 2.
Sensitivity, specificity, and predictive value analyses compared to perometry (%).
| Detection of RVC > 10% | Detection of RVC 5–10% | |||||||
|---|---|---|---|---|---|---|---|---|
| SN (%) |
SP (%) |
PPV (%) |
NPV (%) |
SN (%) |
SP (%) |
PPV (%) |
NPV (%) |
|
| 4-cm intervals | 81.9 | 68.4 | 46.5 | 91.9 | 16.0 | 91.5 | 40.0 | 75.5 |
| BMI < 25 (n = 96) | 71.4 | 74.7 | 44.1 | 90.3 | 13.0 | 84.9 | 21.4 | 75.6 |
| BMI 25–30 (n = 94) | 85.0 | 64.9 | 39.5 | 94.1 | 21.7 | 95.8 | 62.5 | 79.1 |
| BMI > 30 (n = 97) |
87.1 |
63.5 |
54.0 |
90.9 |
11.1 |
94.0 |
42.9 |
72.4 |
| 4-cm intervals, end correction | 77.8 | 92.6 | 77.8 | 92.6 | 52.0 | 82.5 | 51.3 | 82.9 |
| BMI < 25 (n = 96) | 71.4 | 93.3 | 75.0 | 92.1 | 47.8 | 79.5 | 42.3 | 82.9 |
| BMI 25–30 (n = 94) | 85.0 | 98.6 | 94.4 | 96.1 | 69.6 | 87.3 | 64.0 | 89.9 |
| BMI > 30 (n = 97) |
77.4 |
85.7 |
72.7 |
88.5 |
40.7 |
80.6 |
45.8 |
77.1 |
| Landmarks | 93.1 | 93.5 | 82.7 | 97.6 | 63.2 | 93.8 | 78.7 | 87.6 |
| BMI < 25 (n = 96) | 90.5 | 94.7 | 82.6 | 97.3 | 60.9 | 94.5 | 77.8 | 88.5 |
| BMI 25–30 (n = 94) | 90.0 | 91.9 | 75.0 | 97.1 | 58.3 | 90.0 | 66.7 | 86.3 |
| BMI > 30 (n = 97) |
96.8 |
93.7 |
88.2 |
98.3 |
66.7 |
97.0 |
90.0 |
87.8 |
| Landmarks, midpoint | 90.3 | 93.5 | 82.3 | 96.6 | 66.7 | 90.1 | 70.4 | 88.4 |
| BMI < 25 (n = 96) | 81.0 | 94.7 | 81.0 | 94.7 | 73.9 | 90.4 | 70.8 | 91.7 |
| BMI 25–30 (n = 94) | 95.0 | 93.2 | 79.2 | 98.6 | 56.5 | 90.1 | 65.0 | 86.5 |
| BMI > 30 (n = 97) | 93.5 | 93.7 | 87.9 | 96.7 | 70.4 | 91.0 | 76.0 | 88.4 |
Abbreviations: BMI, body mass index; NPV, negative predictive value; PPV, positive predictive value; RVC, relative volume change; SN, sensitivity; SP, specificity.