This observational study aims to investigate the incidence and risk factors for falls in the first 12 months post hospital discharge in patients following an ICU admission. It also aims to determine factors at hospital discharge which may predict future falls risk at 12 months and examine the physical activity levels of ICU survivors. Furthermore, it also will investigate the relationship between falls, fear of falling and activity limitations and participation restriction. It is a multicentre study over three sites: UK Healthcare, Melbourne Health and Austin Health. All adult patients in intensive care that have been mechanically ventilated for over 24 hours, and remain in the ICU more than 4 days will be considerer for inclusion. The primary outcome measure is a 12 month falls diary which commences on hospital discharge. There will also be Physiotherapy assessments just prior to hospital discharge, 3, 6, and 12 months post hospital discharge.