Table 4.

RRs and 95% CIs of NHL according to use of artificial tanning devices in successive decades of life

Age period and use of artificial tanning devices*No. of casesAge-adjustedMultivariate
RR (95% CI)RR (95% CI)
20-29 y (n = 86,399)
    Never1171.001.00
    Rarely or ≥1 time/mo100.48 (0.25-0.94)0.47 (0.24-0.91)
P = 0.02P = 0.01
30-39 y (n = 85,173)
    Never671.001.00
    Rarely451.24 (0.84-1.81)1.11 (0.75-1.64)
    ≥1 time/mo181.00 (0.59-1.69)1.03 (0.60-1.76)
Ptrend = 0.70Ptrend = 0.79
40-49 y (n = 39,877)
    Never391.001.00
    Rarely230.68 (0.41-1.14)0.61 (0.36-1.04)
    ≥1 time/mo160.74 (0.41-1.32)0.74 (0.40-1.36)
Ptrend = 0.20Ptrend = 0.19
Combined, 10-39 y (n = 77,221)
    Never, 10-39 y591.001.00
    Rarely, 10-39 y381.12 (0.74-1.70)1.01 (0.66-1.54)
    ≥1 time/mo in 1-3 decades, 10-39 y150.90 (0.50-1.60)0.93 (0.52-1.68)
Ptrend = 0.91Ptrend = 0.86

NOTE: Poisson regression analysis. All statistical tests were two-sided. Analyses of solarium use at ages 40 to 49 years included only women ≥40 years when answering the questionnaire.

  • *Because there were only two cases that had any solarium exposure before age 20 years, no risk estimates were calculated.

  • Multivariate models included attained age, region of residence, eye color, hair color, skin reaction after heavy sun exposure in the beginning of the summer and after repeated sun exposure, and solar exposure (corresponding number of age-specific sunburns and weeks on annual summer vacations).