Sensitivity and specificity of NICE guideline symptoms alone in validation population (n=1 826 293)
| Symptom | Patients requiring a chest x-ray based on NICE guideline | Patients not requiring a chest x-ray based on NICE guideline | No. of true positives | No. of true negatives | Sensitivity (%) | Specificity (%) |
|---|---|---|---|---|---|---|
| Haemoptysis | 1843 | 1824450 | 24 | 1822746 | 1.39 | 99.90 |
| Cough | 175290 | 1651003 | 413 | 1649688 | 23.90 | 90.42 |
| Chest/shoulder pain | 107753 | 1718540 | 192 | 1717004 | 11.11 | 94.10 |
| Dyspnoea | 61631 | 1764662 | 315 | 1763249 | 18.23 | 96.64 |
| Weight loss | 7679 | 1818614 | 26 | 1816912 | 1.50 | 99.58 |
| Voice hoarseness | 5209 | 1821084 | 9 | 1819365 | 0.52 | 99.72 |
NICE, National Institute for Health and Clinical Excellence.