Assignment of patients meeting different severity rules to pneumonia severity index (PSI) risk class scoring system
| PSI risk class | Total | |||||
|---|---|---|---|---|---|---|
| I | II | III | IV | V | ||
| Modified ATS rule | 1/34 (3%) | 3/50 (6%) | 6/98 (6%) | 34/194 (18%) | 33/113 (29%) | 77/489 (16%) |
| BTS I rule | 0/34 (0) | 1/50 (2%) | 1/97 (1%) | 28/192 (15%) | 47/112 (42%) | 77/485 (16%) |
| BTS II rule | 0/34 (0) | 3/50 (6%) | 2/98 (2%) | 38/194 (20%) | 59/113 (52%) | 102/489 (21%) |
| Modified BTS rule | 0/34 (0) | 2/49 (4%) | 2/97 (2%) | 37/190 (20%) | 73/112 (65%) | 114/482 (24%) |