Table 3.

Summary of evidence on outcomes

Outcome measure	No of studies	Studies with significant positive effect	Studies with no effect	Best evidence synthesis
Screening
Preferences for screening	2	One medium-quality/high-quality and one high-quality RCT	None	Evidence of positive effect
Intention to attend screening	8	One medium-quality RCT*	One high-quality, one medium-quality/high-quality and four medium-quality RCTs*	Evidence of no effect
Attendance at screening	12	One high-quality RCT	Two high-quality, two medium-quality/high-quality and seven medium-quality studies	Evidence of no effect
Health-related behaviours
Intention to change health-related behaviours
To tan	1	One low/medium RCT	None	Limited evidence of positive effect
To protect skin	1	None	One low/medium RCT	Limited evidence of no effect
Health-related behaviours
Smoking cessation	1	None	One high-quality RCT	Limited evidence of no effect
Smoking abstinence	1	One high-quality RCT	None	Limited evidence of positive effect
Sun protection	2	Two medium-quality RCTs		Indicative evidence of positive effect
Tanning bed usage	1	None	One low/medium RCT	Limited evidence
Adult skin examination	2	Two medium-quality RCTs	None	Indicative evidence of positive effect
Child skin examination	1	None	One medium-quality RCT	Limited evidence of no effect
Breast examination	3	Two high-quality RCTs	One medium/high RCT	Indicative evidence of positive effect
Diet	0	None	None	No evidence
Physical activity	0	None	None	No evidence
Alcohol	0	None	None	No evidence

*One medium-quality study reported a significant positive effect in low-risk women and no effect in high-risk women.

RCT, randomised controlled trial.