Comparison of three severity rules in predicting death from community acquired pneumonia in 188 patients with complete data5-150
| Severity prediction rule | Sensitivity (%) | Specificity (%) |
| BTS rule | 52 | 79 |
| Modified BTS rule | 66 | 73 |
| Risk class V** | 44 | 85 |
| Derivation studies: | ||
| BTS rule | 88 | 79 |
| Modified BTS rule | 95 | 71 |
↵5-150 Based on 188 (77%) patients for whom complete data for respiratory rate, urea, diastolic blood pressure, and presence of confusion was available. **Where data were missing, these were taken to be within the normal range. This may have led to underestimation of severity in some patients.