Table 5 Discordant predictions of hospital mortality from three clinical prediction rules
PSI class ⩾IVCURB-65 ⩾3No (%) patientsNo (%) deaths
IDSA/ATS ⩾3
    +NA32 (2.6)4 (12.5)
    −+NA324 (26.1)31 (9.6)
    +NA99 (8.0)43 (43.4)
    −NA+58 (4.7)6 (10.3)
IDSA/ATS ⩾2
    +NA118 (9.5)6 (5.1)
    −+NA169 (13.6)7 (4.1)
    +NA282 (22.7)63 (22.3)
    −NA+0 (0)0 (NA)
  • ATS, American Thoracic Society; CURB, confusion, urea nitrogen, respiratory rate, blood pressure; IDSA, Infectious Diseases Society of America; PSI, Pneumonia Severity Index; NA, not applicable.