Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
RCT	46 people with moderate to severe plaque psoriasis	Moderate phototoxic erythema 4/20 (20%) with low-dose bath methoxsalen (1 mg/L) plus UVA 4/21 (19%) with high-dose bath methoxsalen (5 mg/L) plus UVA	Significance not assessed