Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Prevention of pressure ulcers
Systematic review	70 people in medical or surgical hospital wards Data from 1 RCT	Incidence of pressure ulcers 10 days 0 with electrically operated profiling bed 0 with standard hospital bed	Reported as not significant P value not reported The low event rate means that the RCT was underpowered to detect a clinically important difference between groups		Not significant