Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Psoriasis severity
RCT	183 people with moderate to severe psoriasis	Clearance rates time of assessment not reported 88% with PUVA 80% with broadband UVB Absolute numbers not reported	RR 0.62 95% CI 0.29 to 1.22		Not significant
RCT	100 people	Clearance rates time of assessment not reported 84% with PUVA 63% with narrowband UVB Absolute numbers not reported	OR 3.0 95% CI 1.2 to 7.8	Moderate effect size	PUVA
RCT	88 people with chronic plaque psoriasis with skin types from I to IV Subgroup analysis	Proportion clear of psoriasis at the end of the treatment period time of assessment not reported 31/37 (84%) with PUVA 22/34 (65%) with UVB	P = 0.02	Effect size not calculated	PUVA