Table 4.

Association between indoor tanning device types and period of indoor tanning use and the likelihood of melanoma (Skin Health Study)

Indoor tanningCasesControlsAge- and gender-adjusted OR (95% CI)Multivariate adjusted OR* (95% CI)
n (%)n (%)
Never used433 (37.1)538 (48.9)1.001.00
Ever used device
    Conventional697 (59.7)535 (48.6)1.83 (1.51-2.21)1.76 (1.43-2.17)
    High speed/high intensity200 (17.1)118 (10.7)2.72 (1.99-3.70)2.86 (2.03-4.03)
    High pressure55 (4.7)25 (2.3)3.79 (2.22-6.49)4.44 (2.45-8.02)
    Sun lamp108 (9.3)79 (7.2)1.88 (1.34-2.63)1.85 (1.27-2.70)
Periods of use
    Before 1990135 (11.6)96 (8.7)1.85 (1.37-2.49)1.63 (1.18-2.27)
    After 1990269 (23.1)223 (20.3)1.72 (1.36-2.19)1.78 (1.37-2.32)
    Both periods327 (28.0)235 (21.3)1.94 (1.55-2.44)1.83 (1.42-2.36)
Adjusted for no. of years used
    Before 19901.76 (1.30-2.38)1.53 (1.09-2.13)
    After 19901.51 (1.61-1.95)1.51 (1.14-2.01)
    Both periods1.33 (0.96-1.84)1.15 (0.81-1.64)
  • *Adjusted for age, gender, eye color, natural hair color, skin color, freckles, moles, income, education, family history of melanoma, routine sun exposure, outdoor activity sun exposure, outdoor job exposure, mean sunscreen use, and number of lifetime painful sunburns; an additional 16 cases and 12 controls were excluded because the number of missing values was too small to be included as its own category.

  • *Adjusted for age, gender, eye color, natural hair color, skin color, freckles, moles, income, education, family history of melanoma, routine sun exposure, outdoor activity sun exposure, outdoor job exposure, mean sunscreen use, and number of lifetime painful sunburns; an additional 16 cases and 12 controls were excluded because the number of missing values was too small to be included as its own category.