Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Psoriasis improvement
Systematic review	296 people with severe psoriasis 3 RCTs in this analysis	Improvement in psoriasis (measured by proportion of people with a 75% or greater decrease in total score on a scale from 1–16, complete or satisfactory remission, or overall improvement) with topical corticosteroid plus an oral retinoid with topical corticosteroid or oral retinoid alone	ARRs all significant	Effect size not calculated	topical corticosteroid plus an oral retinoid