Plots represent mortality rates of patients grouped according to quartiles of driving pressure (ΔP), peak airway pressure (P_peak; i.e., P_peak = PEEP + pressure support level), and respiratory system compliance (C_RS). Mortality increased across quartiles of increasing ΔP (P = 0.002), decreased with increasing C_RS (P < 0.001), but was unrelated to P_peak (P = 0.831).