Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Healing rates
Systematic review	120 elderly people with pressure ulcers in a nursing home, 101 completed study, grade III or IV Data from 1 RCT	Complete ulcer healing 4 weeks 45% with layered-foam replacement mattress 48% with water mattress Absolute numbers not reported	Reported as not significant P value not reported		Not significant