New evidence on the damaging effect of sunbeds
The study followed 141,000 Norwegian women for the average of 14 years. Women who had 30 or more indoor tanning sessions were at 32% increased risk of melanoma compared to never-users. In addition, women who started indoor tanning before age 30 were on average 2 years younger at melanoma diagnosis than never-users. These associations remained significant after controlling for age, birth-cohort, ambient UV of residence, hair color, skin color, and cumulative number of sunburns and sunbathing vacations.
Public health importance
Modern sunbeds emit six times more UVA and twice as much UVB as Oslo summer sun. The findings of this study have important implications for public health, as it shows that sunbed use increases the burden of melanoma in societies by both increasing the number of patients and decreasing the age at diagnosis.