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Table 2 Median cotinine concentrations (ng/ml) and interquartile ranges in adult daily smokers, according to individual characteristics, type of tobacco, and smoking characteristics.

From: Salivary cotinine concentrations in daily smokers in Barcelona, Spain: a cross-sectional study

  n median(IQR*) p-value
Total 211 146.5 (86.8, 220.5) -
Individual characteristics    
   Sex    
men 104 172.6 (115.3, 255.4) < 0.001
women 107 120.7 (69.6, 208.8)  
   Age (years)    
17-44 120 127.1 (82.8, 297.1) 0.090
45-64 79 171.1 (103.9, 239.4)  
≥ 65 12 135.8 (54.6, 215.7)  
   Educational level    
less than primary and primary 68 173.9 (106.1, 295.8) 0.194
secondary 74 134.4 (86.5, 216.2)  
university 68 137.7 (67.4, 194.7)  
   Body mass index (kg/m 2)    
underweight 4 132.3 (72.4, 281.8) 0.151
normal 116 127.9 (85.1, 219.5)  
overweight 66 155.3 (88.7, 223.3)  
obese 21 166.6 (91.2, 224.2)  
Type of tobacco    
   Type of cigarettes    
regular 148 149.5 (96.6, 229.8) 0.313
non-regular (light, ultralight, etc.) 63 128.4 (74.7, 214.8)  
   Type of tobacco    
blond 171 137.0 (84.5, 219.6) 0.043
black 40 180.2 (128.6, 259.5)  
   Use of filter tip    
with filter 209 146.9 (89.7, 220.5) 0.157
without filter 2 41.9 (12.7, 71.0)  
Smoking characteristics    
   Frequency of inhalation    
all the time 21 166.6 (101.5, 207.1) 0.473
half the time 150 137.1 (83.1, 220.2)  
seldom 39 177.3 (108.6, 248.8)  
   Depth of inhalation    
light 22 151.3 (80.6, 306.9) 0.957
moderate 78 142.8 (98.8, 220.2)  
deep 108 146.7 (84.8, 213.7)  
  1. Barcelona (Spain), 2004-2005.
  2. * IQR: interquartile range
  3. † non-parametric test for medians
  4. ‡ underweight: <18.50 kg/m2; normal: 18.50-24.99 kg/m2; overweight: 25.00-29.99 kg/m2; obese: _30.00 kg/m2