Mapping Global Indoor Tanning: A Timeline and Review of the 2014 Meta-Analysis
Understanding how frequently people use artificial ultraviolet devices is an essential step in assessing skin health hazards. For years, public health officials recognized artificial tanning as a hazard, yet broad international exposure figures were scattered across individual regional surveys. In 2014, a major paper published in JAMA Dermatology gathered these disparate records to build an international portrait of indoor tanning usage across Western countries.
Background: Evaluating the Scope of an Established Carcinogen
Indoor tanning equipment emits ultraviolet radiation, which medical researchers have categorized as a human carcinogen. While the biological risks of artificial ultraviolet exposure had been demonstrated, researchers emphasized that the true scope of population-level exposure remained insufficiently described. Public health professionals needed consolidated data to quantify exposure and evaluate attributable health burdens.
To understand the biological concerns associated with artificial tanning units, individuals frequently review the evidence surrounding tanning beds and UV exposure. The goal of the 2014 paper was to establish systematic baseline figures for ever-exposure and recent exposure across diverse age categories in Western nations.
Search Chronology: Assembling Decades of Literature
A rigorous timeline guided the synthesis conducted by the research team. The literature search was last performed on March 16, 2013, across three extensive research databases to ensure historical coverage:
- PubMed, covering records indexed from 1966 to the search date
- Scopus, covering records indexed from 1823 to the search date
- Web of Science, covering records indexed from 1898 to the search date
In addition to computerized database indexing, the investigators hand searched reference lists and reviewed publicly available data that had not yet appeared in scientific journals. The primary query identified 1976 unique records for consideration.
Methodological filtering was strict. Two independent investigators screened the abstracts and applied predetermined criteria. The researchers excluded case-control studies, reports that provided insufficient study details, and reports where participant cohorts had been selected based on factors directly linked to their indoor tanning behavior. Following this screening, 161 records underwent full-text review, resulting in 88 records being selected for the quantitative synthesis. In total, the combined dataset represented 406 696 participants, as documented in the JAMA Dermatology systematic review and meta-analysis.
Prevalence Breakdown: Lifetime and Past-Year Exposure
Data extraction was handled independently by two researchers who pulled participant demographics, inclusion criteria, data collection formats, and statistical outcomes. The study employed random-effects meta-analyses to calculate summary prevalence estimates across three defined age groups: adolescents, university students, and general adults.
The statistical findings revealed elevated rates among younger populations, particularly those attending universities:
- Adolescents: Summary prevalence of ever exposure was 19.3% (95% CI, 14.7%-24.0%), while past-year exposure reached 18.3% (95% CI, 12.6%-24.0%).
- University Students: Summary prevalence of ever exposure reached 55.0% (95% CI, 33.0%-77.1%), with past-year exposure calculated at 43.1% (21.7%-64.5%).
- Adults: Summary prevalence of ever exposure stood at 35.7% (95% CI, 27.5%-44.0%), with past-year exposure at 14.0% (95% CI, 11.5%-16.5%).
These calculations illustrated that exposure was common in Western nations, showing particularly concentrated use among young persons and university-aged individuals.
Estimated Cancer Burden Across Western Countries
Beyond mapping usage rates, the investigators evaluated the public health consequences linked to these figures. The authors calculated the population proportional attributable risk associated with indoor tanning in the United States, Europe, and Australia for both nonmelanoma skin cancer (NMSC) and melanoma.
The calculated population proportional attributable risks were:
- 3.0% to 21.8% for nonmelanoma skin cancer
- 2.6% to 9.4% for melanoma
Translating these percentages into annual figures, the authors reported that indoor tanning accounted for more than 450 000 cases of nonmelanoma skin cancer and more than 10 000 cases of melanoma each year across the United States, Europe, and Australia combined. Learning about the differences between these conditions is critical for individuals evaluating skin changes; readers can review our educational guide on types of skin cancer to understand how melanoma and nonmelanoma cases present differently.
Study Design, Limits, and Practical Medical Context
When reviewing these figures, it is essential to interpret them within the boundaries of scientific design. This paper represents a single systematic review and meta-analysis that synthesized historical observational studies available up through early 2013. Meta-analyses rely on data collected under differing sampling designs and self-reported survey formats, which introduces statistical variability, reflected in the wide confidence intervals seen in groups like university students.
Because this research gathered historical surveys to highlight a broad public health issue, it does not evaluate individual skin risk or replace personal dermatological care. Unregulated methods sought online to accelerate tanning—such as unlicensed melanotan products—pose independent chemical and health hazards. Anyone with a history of indoor tanning or questions about UV-induced changes should consult a board-certified dermatologist for regular skin examinations rather than self-assessing.
Sources
Published October 28, 2026. Sources are linked in the text. See our Medical Disclaimer.