Consecutive patients with Vegetative State or Minimally Conscious State were enrolled in ICU on the third day after an ABI. They were randomized to undergo conventional physiotherapy alone or associated to fifteen 30-minute sessions of verticalization, using a tilt table with robotic stepping device. Once stabilized, patients were transferred to a Neurorehabilitation unit for an individualized treatment. Outcome measures were assessed on the third day from the injury (T0), at ICU discharge (T1) and at Rehab discharge (T2).