Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Symptom improvement
Systematic review	People with psoriasis (severity not reported), number of people in analysis not reported Data from 1 RCT	Psoriasis severity scores between groups 3 weeks with salicylic acid with placebo Absolute results not reported	SMD –0.80 95% CI –1.71 to +0.11		Not significant