Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Healing
[36] Systematic review	714 people 7 RCTs in this analysis	Rates of ulcer healing 158/358 (44%) with hydrocolloid dressing 140/356 (39%) with simple low-adherent dressing	OR 1.45 95% CI 0.83 to 2.54		Not significant
[37] Systematic review	782 people 8 RCTs in this analysis	Ulcer healing 172/397 (43%) with hydrocolloid dressing 168/385 (44%) with simple low-adherent dressing	RR 0.99 95% CI 0.85 to 1.15		Not significant
[38] Systematic review	792 people 8 RCTs in this analysis	Ulcer healing 190/397 (48%) with hydrocolloid dressing 170/395 (45%) with simple low-adherent dressing	RR 1.09 95% CI 0.89 to 1.34		Not significant