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Table 4 Correlates of persistent indoor tanning among female indoor tanners age 31 and over (n = 170)

From: Lifetime history of indoor tanning in young people: a retrospective assessment of initiation, persistence, and correlates

   % Persistently      
   Tanned Univariate    Multivariate  
Characteristic N Indoors OR (95% CI) P valuea N OR (95% CI) P valueb
Eye color        
   Brown 71 28 1.00 0.431    
   Hazel 36 28 0.98 (0.40 - 2.40)     
   Green 14 29 1.02 (0.29 - 3.63)     
   Blue/grey 49 16 0.50 (0.20 - 1.25)     
Skin color        
   Olive 33 27 1.00 0.902    
   Fair 106 24 0.82 (0.34 2.0)     
   Very fair 31 26 0.93 (0.31 - 2.82)     
Skin reaction with first summer sun exposure        
   Sunburn 76 18 1.00 0.085    
   Tan 94 30 1.88 (0.91 - 3.90)     
Skin reaction with prolonged sun exposure        
   Deep Tan 35 40 1.00 0.023 35 1.00 0.031
   No/Mild/Moderate Tan 135 21 0.39 (0.18 - 0.87)   135 0.39 (0.16 - 0.91)  
BMI (kg/m2) 170 - 1.02 (0.96 - 1.08) 0.535    
Pounds Gained since age 18 (per 10 lbs) 170 - 1.14 (0.86 - 1.49) 0.364    
Alcoholic drinks under age 25 (per 300 drinks) 170 - 1.05 (1.01 - 1.09) 0.015 170 1.05 (1.01 -1.09) 0.015
Alcoholic drinks/year over age 25 (per 100 drinks) 170 - 1.09 (0.96 - 1.23) 0.156    
Smoking Status        
   Not Current Smoker 144 23 1.00 0.217    
   Current Smoker 26 35 1.78 (0.73 - 4.37)     
Education        
   Less than Bachelor's Degree 57 39 1.00 0.003 57 1.00 0.002
   Bachelor's Degree or more 113 18 0.34 (0.17 - 0.70)   113 0.29 (0.14 -0.63)  
Sunbathing session ages 8-15 (per 50 sessions) 170 - 1.09 (0.99 - 1.21) 0.087    
Sunbathing session ages 16-25 (per 50 sessions) 170 - 1.10 (1.01 - 1.20) 0.033 170 1.10 (1.00 -1.21) 0.044
Sunbathing session ages 26+ (per 50 sessions) 169 - 1.09 (0.99 - 1.20) 0.086    
Age at skin biopsy 170 - 0.93 (0.80 - 1.08) 0.344    
  1. a P values are from likelihood ratio tests comparing a model with the variable of interest to the null model.
  2. b P values are from likelihood ratio tests comparing the full model to the full model minus the variable of interest.
  3. BMI body mass index; CI confidence interval; OR odds ratio