Comparison 13. Irradiation with UV light: whole‐body UVB versus placebo or local UVB hands.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Primary: investigator‐rated good/excellent control of symptoms by UVB hand vs whole‐body UVB vs placebo	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
1.1 Local UVB hands alone vs placebo	1		Risk Ratio (M‐H, Random, 95% CI)	0.0 [0.0, 0.0]
1.2 Whole‐body UVB + local UVB hands vs placebo	1		Risk Ratio (M‐H, Random, 95% CI)	0.0 [0.0, 0.0]
1.3 Whole body UVB + local UVB hands versus local UVB hands alone	1		Risk Ratio (M‐H, Random, 95% CI)	0.0 [0.0, 0.0]
2 Secondary: time until relapse depicted in weeks of remission	1		Mean Difference (IV, Random, 95% CI)	Totals not selected
2.1 Local UVB hands alone vs placebo (high score = better outcome)	1		Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]
2.2 Whole‐body UVB + local UVB hands vs placebo (high score = better outcome)	1		Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]
2.3 Whole‐body UVB + local UVB hands vs local UVB hands alone (high score = better outcome)	1		Mean Difference (IV, Random, 95% CI)	0.0 [0.0, 0.0]