Table 1 CPIS Score [6]

Patient temperature

 ≥ 36.5 °C and ≤ 38.4 °C (0 points)

 ≥ 38.5 °C and ≤ 38.9 °C (1 point)

 ≥ 39 °C (2 points)

 ≤ 36 °C (2 points)

WBC

 ≥ 4000/mm-3 and ≤ 11,000/mm⁻³ (0 points)

 < 4000/mm-3 or > 11,000/mm⁻³ (1 point)

 < 4000/mm-3 or > 11,000/mm⁻³ with ≥ 50 bands (2 points)

Tracheal secretions

 Absent (0 points)

 Present, non-purulent (1 point)

 Present, purulent (2 points)

PaO2 (mmHg)/FiO2

 > 240 or ARDS present (0 points)

 ≤ 240 or no ARDS present (2 points)

Chest X-ray

 No infiltrate (0 points)

 Patchy or diffuse infiltrate (1 point)

 Distinct infiltrate (2 points)

Quantitative pathogenic bacterial culture growth from tracheal aspirate

 ≤ 1 + or no growth (0 points)

  > 1 + (1 point)

 > 1 + and the same bacteria were seen on the gram stain (2 points)