A method of evaluating the likelihood that an occupant will exit an occupant support comprises determining if the location of the occupant on the occupant support is displaced relative to a reference location, and if the location of the occupant is so displaced, designating that the occupant is at a risk of exiting the occupant support which is elevated relative to the baseline risk. A support apparatus comprises a framework, a mattress, sensors distributed on the support apparatus to sense occupant weight distribution on the support apparatus, and a processor adapted to designate a risk of occupant egress as a function of the direction of the occupant weight distribution and the elevation status of the perimeter panels.
