Comparison 21. Irradiation with Grenz ray.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Primary: investigator‐rated improvement good/excellent control			Other data	No numeric data
1.1 after 1 month			Other data	No numeric data
1.2 after 3 months			Other data	No numeric data
1.3 after 6 months			Other data	No numeric data
1.4 Hyperkeratotic eczema after 6 months			Other data	No numeric data
1.5 Pompholyx after 6 months			Other data	No numeric data
1.6 Chronic palmar eczema after 6 months			Other data	No numeric data
2 Primary: adverse events ‐ hyperpigmentation			Other data	No numeric data