Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
RCT	588 white people with 1–30 actinic (solar) keratoses	Skin reactions 32/210 (15%) with sunscreen (sun protection factor [SPF] 17) 28/221(13 %) with placebo (base cream with no active ingredient)