At MV onset (Day 0) and on Days 3, 7 and 10, until death or discharge, whichever occurred first, we recorded: (1) MV-related variables. (2) MV modes: volume-controlled ventilation (VCV); pressure-controlled ventilation (PCV); bilevel mode; pressure support ventilation (PSV); other. (3) Tidal volume (Vt, in ml/kg of IBW) (4) Pressures: peak, plateau pressures, total positive end-expiratory pressure (PEEP) and driving pressure (plateau pressure -PEEP), in cmH2O. The main outcome measure was hospital mortality; secondary outcomes were length of MV, of ICU (LOSICU) and of hospital (LOSHOSP) stays.