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. 2014 Aug 18;2014:1709.
Ref (type) Population Outcome, Interventions Results and statistical analysis Effect size Favours
Incidence of actinic (solar) keratosis

RCT
588 people with previous solar keratoses, aged over 40 years, living in Victoria, Australia Mean number of new lesions per person 7 months
1.6 with daily sunscreen use (sun protection factor [SPF] 17)
2.3 with placebo (base cream with no active ingredient)

RR 0.62
95% CI 0.54 to 0.71
Small effect size daily sunscreen use