Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Prevention of pressure ulcers
Systematic review	98 people with incontinence, admitted to acute and long-stay hospital wards Data from 1 RCT	Development of pressure ulcers (grade 2 to 4) 60 days 8/42 (19%) with low-air-loss hydrotherapy beds 4/56 (7%) with support surfaces	RR 2.67 95% CI 0.86 to 8.37 The RCT is likely to have been underpowered to detect a clinically important difference between groups		Not significant