Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Prevention of pressure ulcers
Systematic review	2016 people 5 RCTs in this analysis	Incidence of pressure ulcers 10 to 15 days with foam alternative mattress with standard hospital mattress Absolute results not reported	RR 0.40 95% CI 0.21 to 0.74	Moderate effect size	foam alternative mattress
Systematic review	101 people in the emergency department and after admission to hospital with hip fracture Data from 1 RCT	Incidence of pressure ulcers 14 days 4/48 (8%) with foam mattress 8/53 (15%) with standard hospital mattress	Reported as not significant P value not reported		Not significant