Test characteristics of SR-CXR in the study population
| Test characteristic | Lung cancer diagnosis (within 1 year of SR-CXR) | No diagnosis of lung cancer (within 1 year of SR-CXR) | Total, n |
|---|---|---|---|
| Positive x-ray result, n | 86 | 867 | 953 |
| Negative x-ray result, n | 28 | 8015 | 8043 |
| Total, n | 114 | 8882 | 8996 |
| Sensitivity, % (95% CI) | 75.4 (67.5 to 83.3) | — | — |
| Specificity, % (95% CI) | 90.2 (89.6 to 90.9) | — | — |
| PPV, % (95% CI) | 9.02 (7.21 to 10.8) | — | — |
| NPV, % (95% CI) | 99.7 (99.5 to 99.8) | — | — |
NPV = negative predictive value. PPV = positive predictive value. SR-CXR = self-requested chest X-ray.