Table 3

ORs for biomarkers, PSI and severe outcome

OR95% CIAdjusted ORAdjusted 95% CI
OR for biomarkers*
PCT†1.81.3 to 2.31.71.3 to 2.2
CRP‡1.81.3 to 2.61.81.3 to 2.6
Lymphocytes‡0.60.3 to 0.90.70.4 to 1.1
Ferritin‡1.30.99 to 1.81.41.04 to 1.9
PCT in groups†
PCT <0.10 ng/mLRefRefRefRef
PCT 0.10–0.25 ng/mL6.21.7 to 235.51.5 to 20.7
PCT 0.25–0.50 ng/mL11.12.4 to 51.610.52.1 to 52.1
PCT >0.50 ng/mL20.14.8 to 83.4163.8 to 68.4
OR for PSI groups
PSI group 1RefRef
PSI group 20.980.2 to 4.8
PSI group 33.70.9 to 15.2
PSI group 45.51.4 to 21.3
PSI group 58.81.6 to 47.8
  • *The log2 was used, in this way the ORs refer to a doubling in the value of the variable.

  • †Adjusted for age and severe kidney disease (On dialysis, creatinine >270 µmol/L, uraemia, history of kidney transplant).

  • ‡Adjusted for age.

  • CRP, C reactive protein; PCT, procalcitonin; PSI, Pneumonia Severity Index.