Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Symptom improvement
Systematic review	People with psoriasis; number of people not reported	Rate of marked improvement 12 weeks with PUVA plus calcipotriol with PUVA alone	RR 1.2 95% CI 0.9 to 1.6		Not significant
	People with psoriasis; number of people not reported	Rate of marked improvement at 8 weeks with UVB plus calcipotriol with UVB alone	RR 1.0 95% CI 0.8 to 1.1		Not significant
RCT	164 people	Median number of UVB treatments required to achieve clearance 22 with UVB plus calcipotriol 25 with UVB alone	RR 3.66 95% CI 2.16 to 6.20	Moderate effect size	UVB plus calcipotriol