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Table 3 Correlates of ever indoor tanning among females (n = 281)

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

   % Ever      
   Tanned Univariate P valuea   Multivariate P valueb
Characteristic N Indoors OR (95% CI)   N OR (95% CI)  
Eye color        
   Brown 114 79 1.00   101 1.00  
   Hazel 55 75 0.78 (0.37 - 1.66)   51 0.76 (0.31 - 1.83)  
   Green 32 53 0.30 (0.13 - 0.69)   30 0.18 (0.07 - 0.50)  
   Blue/grey 80 72 0.70 (0.36 - 1.37) 0.047 74 0.72 (0.33 - 1.57) 0.008
Skin Color        
   Olive 57 75 1.00     
   Fair 166 77 1.10 (0.54 - 2.22)     
   Very fair 58 60 0.50 (0.22 - 1.10) 0.05    
Skin reaction with first summer sun exposure        
   Sunburn 126 67 1.00     
   Tan 155 78 1.72 (1.01 - 2.92) 0.046    
Skin reaction with prolonged sun exposure        
   Deep tan 48 88 1.00   42 1.00  
   No/Mild/Moderate Tan 233 70 0.34 (0.14 - 0.84) 0.009 214 0.37 (0.12 - 1.18) 0.07
BMI (kg/m2) 280 - 0.97 (0.92 - 1.01) 0.117    
Pounds Gained since age 18 (per 10 lbs) 278 - 0.81 (0.66 - 0.99) 0.037 256 0.80 (0.63 -1.02) 0.063
Alcoholic drinks under age 25 (per 300 drinks) 275 - 1.01 (0.98 - 1.05) 0.454    
Alcoholic drinks/year over age 25 (per 100 drinks) 262 - 1.00 (0.90 - 1.11) 0.988    
Smoking Status        
   Not Current Smoker 238 72 1.00     
   Current Smoker 41 83 1.86 (0.79 - 4.41) 0.136    
Education        
   Less than Bachelor's Degree 94 78 1.00     
   Bachelor's Degree or more 185 72 0.74 (0.41 - 1.32) 0.296    
Sunbathing session ages 8-15 (per 50 sessions) 279 - 1.25 (1.13 - 1.39) < 0.001 256 1.26 (1.11 - 1.42) < 0.001
Sunbathing session ages 16-25 (per 50 sessions) 279 - 1.18 (1.09 - 1.29) < 0.001    
Sunbathing session ages 26+ (per 50 sessions) 257 - 1.29 (1.12 - 1.49) < 0.001 256 1.23 (1.05 - 1.44) 0.003
Age at skin biopsy 281 - 0.98 (0.93 - 1.04) 0.549 256 0.90 (0.81 - 0.99) 0.037
  1. aP values are from likelihood ratio tests comparing a model with the variable of interest to the null model.
  2. bP 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