Fig. 2From: Continuous assessment of neuro-ventilatory drive during 12 h of pressure support ventilation in critically ill patientsPercentage of the collected breaths (including all the patients and the whole study period) belonging to the “Low” (28%), “Normal” (50%) and “High” (22%) neuro-ventilatory drive class (chi-square = 45; p = 0.0001)Back to article page