Statistical results | Low-dose CT (45 mAs) | Ultra-low-dose CT (22 mAs) | ||||||
---|---|---|---|---|---|---|---|---|
Observer 1 | Observer 2 | Observer 1 | Observer 2 | |||||
Value | 95% CIa | Value | 95% CI | Value | 95% CI | Value | 95% CI | |
Sensitivity | 96.84% | 91.05 to 99.34% | 96.84% | 91.05 to 99.34% | 96.84% | 91.05 to 99.34% | 96.84% | 91.05 to 99.34% |
Specificity | 22.22% | 2.81 to 60.01% | 22.22% | 2.81 to 60.01% | 22.22% | 2.81 to 60.01% | 22.22% | 2.81 to 60.01% |
Positive predictive value (PPV) | 92.93% | 90.25 to 94.92% | 92.93% | 90.25 to 94.92% | 92.93% | 90.25 to 94.92% | 92.93% | 90.25 to 94.92% |
Negative predictive value (NPV) | 40.00% | 11.31 to 77.70% | 40.00% | 11.31 to 77.70% | 40.00% | 11.31 to 77.70% | 40.00% | 11.31 to 77.70% |
Positive likelihood ratio | 1.25 | 0.88 to 1.77 | 1.25 | 0.88 to 1.77 | 1.25 | 0.88 to 1.77 | 1.25 | 0.88 to 1.77 |
Negative likelihood ratio | 0.14 | 0.03 to 0.74 | 0.14 | 0.03 to 0.74 | 0.14 | 0.03 to 0.74 | 0.14 | 0.03 to 0.74 |
Accuracy | 90.38% | 83.03 to 95.29% | 90.38% | 83.03 to 95.29% | 90.38% | 83.03 to 95.29% | 90.38% | 83.03 to 95.29% |