IL6 and ventilator-associated pneumonia: The treatment efficacy indices were oxygenation index (PaO2/FiO2), procalcitonin (PCT), C-reactive protein (CRP), and interleukin-6 (IL-6) levels (all measured before and within 7 days of treatment), and VAP, bacteremia, time to first mechanical ventilation, CRRT, length of stay in ICU, length of stay, and 28 days mortality.