Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Symptom improvement
RCT 4-armed trial	70 people with chronic plaque psoriasis (symmetrical localized) Data from 1 RCT	Clearance 3 weeks 79% with betamethasone plus occlusion for 3 weeks 15% with betamethasone alone for 3 weeks Absolute numbers not reported	P <0.0001 for betamethasone plus occlusion v betamethasone alone	Effect size not calculated	betamethasone plus occlusion
RCT 4-armed trial	70 people with chronic plaque psoriasis (symmetrical localized) Data from 1 RCT	Clearance 2 weeks 86% with clobetasol plus occlusion for 2 weeks 14% with clobetasol alone for 2 weeks Absolute numbers not reported	P < 0.0001 for clobetasol plus occlusion v clobetasol alone	Effect size not calculated	clobetasol plus occlusion
RCT	61 people	Clearance 6 weeks 97% with clobetasol plus occlusion 69% with clobetasol alone Absolute numbers not reported	P = 0.005	Effect size not calculated	clobetasol plus occlusion