Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Prevention of pressure ulcers
Systematic review	672 people acutely ill people aged >5 years Data from 1 RCT	Prevention of pressure ulcers 15 days 118/295 (40%) with nutritional supplements 181/377 (48%) with control	RR 0.83 95% CI 0.70 to 0.99	Small effect size	nutritional supplements
Systematic review	59 people Data from 1 RCT	Prevention of pressure ulcers 6 months with nutritional supplements with control Absolute results not reported	RR 0.22 95% CI 0.01 to 4.28 The RCT was too small to detect a clinically important difference		Not significant
Systematic review	140 people Data from 1 RCT	Prevention of pressure ulcers 2 weeks with nutritional supplements with control Absolute results not reported	RR 0.92 95% CI 0.64 to 1.32 The RCT was too small to detect a clinically important difference		Not significant
Systematic review	103 people Data from 1 RCT	Prevention of pressure ulcers 28 days with nutritional supplements with control Absolute results not reported	RR 0.92 95% CI 0.65 to 1.30 The RCT was too small to detect a clinically important difference		Not significant
RCT	501 people newly admitted to long-term care; mean age 80.1 years In review	Prevention of pressure ulcers 182 days 10% with oral nutritional supplements 12% with control Absolute numbers not reported	P value not reported