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By Li J., Su Y., Zhu L.

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1990) was included in the relevant section. Quantitative approach: meta-analysis (a) Evaluation of exposure: Four types of exposure to indoor tanning appliances were evaluated: • "ever" versus "never"; • "first exposure before age 35 years" versus ''never". 25 Exposure to Artificial UV Radiation and Skin Cancer In addition, another concept was considered in order to make a comparison between recent and distant exposures: • "exposure distant in time" versus "never"; • "exposure recent in time" versus "never".

1990): A case–control study, designed specifically to investigate the melanoma risk associated with artificial UV exposure, was conducted in southern Ontario, Canada between October 1984 and September 1986. Recruitment included 583 incident cases identified from pathology reports and 608 controls selected from property tax assessment rolls. Controls were matched to cases for sex, age and place of residence; 152 cases and 109 controls had ever been exposed to sunlamps or sunbeds. 05). 77). 04).

019 Excluding the cohort study by Veierød et al. 709 Parameter analysed Inclusion criteria Ever use of indoor tanning facility Including study by Walter et al. (1990) First exposure in youth Number of studies Including only those studies with a specific definition of first exposure (studies by Veierød et al. , 2000 excluded) more strongly associated with melanoma than are recent exposures. The latter point is important, as there is most probably a latency period between exposure and melanoma, thus the carcinogenic effect of more recent exposures would not yet be detectable.

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