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Table 1 Median number of cigarettes smoked in the last 24 hours 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 15.0 (8.0, 20.0) -
Individual characteristics    
   Sex    0.002
Men 104 20.0 (10.0, 25.0)  
women 107 10.0 (6.0, 20.0)  
   Age (years)    0.073
17-44 120 12.5 (8.3, 20.0)  
45-64 79 19.0 (10.0, 25.0)  
≥ 65 12 8.5 (4.8, 18.0)  
   Educational level    0.162
Less than primary and primary 68 16.5 (10.0, 20.0)  
secondary 74 14.5 (8.8, 20.0)  
university 68 11.5 (6.0, 20.0)  
   Body mass index (kg/m 2)    0.705
underweight 4 10.0 (7.0, 17.5)  
normal 116 14.0 (8.0, 20.0)  
overweight 66 15.0 (8.0, 20.8)  
obese 21 20.0 (8.5, 30.0)  
Type of tobacco    
   Type of cigarettes    0.040
regular 148 15.0 (8.5, 20.0)  
non-regular (light, ultralight, etc.) 63 10.0 (8.0, 20.0)  
   Type of tobacco    0.003
blond 171 12.0 (8.0, 20.0)  
black 40 20.0 (10.5, 28.8)  
   Use of filter tip    0.207
with filter 209 15.0 (8.0, 20.0)  
without filter 2 7.0 (4.0, 10.0)  
Smoking characteristics    
   Frequency of inhalation    0.014
all the time 21 20.0 (10.5, 20.0)  
half the time 150 11.0 (7.0, 20.0)  
seldom 39 20.0 (12.0, 30.0)  
   Depth of inhalation    0.739
light 22 16.0 (10.0, 22.5)  
moderate 78 12.0 (7.9, 20.0)  
deep 108 15.0 (8.0, 20.0)  
  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