Performance of CRB-65 severity score to predict in-hospital mortality from community-acquired pneumonia
| CRB-65 class (risk class) | 2005, n deaths (% of risk class) | 2006, n deaths (% of risk class) | Total, n deaths (% of risk class) |
| RC 1 (CRB-65 = 0) | 532 (1.76) | 1009 (2.97) | 1541 (2.40) |
| RC 2 (CRB-65 = 1 or 2) | 15 439 (12.09) | 21 871 (14.56) | 37 310 (13.43) |
| RC 3 (CRB-65 = 3 or 4 or requirement for mechanical ventilation at admission) | 9651 (33.56) | 6252 (35.76) | 15 903 (34.39) |
| Total deaths | 25 622 (13.72) | 29 132 (14.44) | 54 757 (14.10) |
The CRB-65 severity score is based on four parameters: C, mental confusion; R, respiratory rate ⩾30/min; B, systolic blood pressure <90 mm Hg or diastolic blood pressure ⩽60 mm Hg; 65, age ⩾65 years).
RC, risk class.