Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Healing rates
Systematic review	28 people Data from 1 RCT	Complete healing with cushion with dry flotation with alternating-pressure cushion Absolute results not reported	Reported as not significant P value not reported		Not significant
RCT 3-armed trial	207 people with grade 3 and 4 pressure ulcers In review	Mean time to complete healing 6 months 3.33 months with bespoke, moulded seat containing alternating-pressure air sacs 4.55 months with solid-foam bed overlay 8.9 cm thick 4.38 with low-air-loss mattress	P value not reported See further information about studies for details on trial methods
RCT 3-armed trial	207 people with grade 3 and 4 pressure ulcers In review	Mean improvement in Pressure Sore Status Score 34.3 with bespoke, moulded seat containing alternating-pressure air sacs 18.4 with low-air-loss mattress	P <0.001 See further information about studies for details on trial methods	Effect size not calculated	alternating-pressure mattress