5. Overview of studies on X‐rays (ionising radiation): investigator‐rated good/excellent control.

Study	Comparison	Investigator‐rated good/excellent control in RR (95% CI)	Comments
King 1984	X‐rays 300 rad versus placebo	No difference after 6 months. Grenz ray effective in 11/15 hands versus 8/15 hands with placebo.	Within‐patient study
Fairris 1984	X‐rays 300 rad versus placebo	No data regarding the primary outcome investigator‐rated good/excellent control	Within‐patient study
Lindelöf 1987	Grenz rays 1800 rad versus placebo	No data regarding the primary outcome investigator‐rated good/excellent control	Within‐patient study
Cartwright 1987	Grenz rays 300 rad versus placebo	No data regarding the primary outcome investigator‐rated good/excellent control	Within‐patient study
Fairris 1985	X‐rays 1 Gy versus Grenz rays 3 Gy	No data regarding the primary outcome investigator‐rated good/excellent control	Within‐patient study
Sheehan‐Dare 1989	X‐rays versus PUVA	No data regarding the primary outcome investigator‐rated good/excellent control	Within‐patient study

CI: confidence interval.

Grenz rays: a type of X‐rays (ionising radiation).

Gy: Gray, a unit of radiation dose.

RR: risk ratio.