Date	Event	Description
20 December 2010	New search has been performed	Third update of review, new searches undertaken. One new trial included; excluded list, pending assessment list and reference list updated. Risk of bias assessment completed.
20 December 2010	New citation required but conclusions have not changed	New author added to the review team.
18 July 2008	New citation required and conclusions have changed	Second update with the inclusion of 11 additional trials.
18 July 2008	New search has been performed	Second update of review.
23 April 2008	Amended	Converted to new review format.
20 May 2004	New citation required and conclusions have changed	First update (substantive amendment) published Issue 3, 2004. This review includes only trials which consider interventions which aim to prevent pressure ulcers. The title of the review has been changed to more accurately reflect the scope of the review. The original review: Beds, mattresses and cushions for preventing and treating pressure ulcers. Cullum N, Deeks J, Sheldon TA, Song F, Fletcher AW, has been substantially updated and now forms the basis of a prevention review and a separate treatment review.