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Table 3 Prediction of current smoking; logistic regression analysis

From: Gender and age differences among current smokers in a general population survey

  Current smoker
  Odds ratio Confidence interval*
Age   
   10 – 19 ref.  
   20 – 29 0.3 0.25 – 0.40
   30 – 39 0.2 0.140 – 0.225
   40 – 49 0.1 0.093 – 0.150
   50 – 59 0.07 0.055 – 0.088
   60 – 69 0.04 0.031 – 0.050
   70 – 79 0.02 0.016 – 0.026
   80 – 89 0.015 0.011 – 0.020
   90 or older 0.013 0.006 – 0.026
Gender   
   Male ref.  
   Female 1.2 0.96 – 1.4
Age by gender   
   10 – 19, female ref.  
   20 – 29, female 1.3 0.8 – 2.1
   30 – 39, female 1.5 0.9 – 2.4
   40 – 49, female 1.7 1.1 – 2.8
   50 – 59, female 2.2 1.4 – 3.5
   60 – 69, female 2.8 1.7 – 4.5
   70 – 79, female 3.0 1.9 – 5.0
   80 – 89, female 4.3 2.4 – 7.6
   90 or older, female 6.9 1.7 – 28.3
Age of onset of smoking   
   10 – 15 ref.  
   16 1.0 0.92 – 1.04
   17 – 18 1.0 0.98 – 1.1
   19 – 20 1.2 1.16 – 1.3
   21 – 25 1.4 1.3 – 1.5
   26 – 70 2.0 1.8 – 2.2
Age of onset of smoking by gender   
   10 – 15, female ref.  
   16, female 1.0 0.9 – 1.1
   17 – 18, female 1.1 0.96 – 1.2
   19 – 20, female 1.2 1.04 – 1.4
   21 – 25, female 0.9 0.8 – 1.1
   26 – 70, female 1.1 0.9 – 1.3
Cigarettes per day   
   less than 5 0.54 0.52 – 0.57
   5 – 20 ref.  
   21 – 40 1.2 1.1 – 1.3
   41 or more 0.4 0.38 – 0.5
Cigarettes per day by gender   
   less than 5, female 0.7 0.6 – 0.8
   5 – 20, female ref.  
   21 – 40, female 1.1 0.97 – 1.2
   41 or more, female 1.1 0.8 – 1.5
Disease (last 4 weeks)   
   not diseased ref.  
   diseased, 1 year or less 0.8 0.78 – 0.9
   diseased, more than 1 year 0.8 0.7 – 0.9
Disease by gender   
   not diseased, female ref.  
   diseased, 1 year or less, female 1.0 0.9 – 1.1
   diseased, more than 1 year, female 1.0 0.8 – 1.1
  1. N = 58,984 ever smokers.
  2. Logistic regression analysis, odds ratios adjusted for school education (years) and household income per household member. All variables in the table were entered into the model in addition to school education and household income per household member.
  3. * 95 %.
  4. ref. Reference category.