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Table 3 Average increase in cotinine concentration (ng/ml) in adult daily smokers per one cigarette smoked in the previous 24 hours, according to individual characteristics, type of tobacco, and smoking characteristics. Barcelona (Spain), 2004-2005.

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

  n β* 95% CI R 2
Total 211 6.4 5.2, 7.7 0.338
Individual characteristics     
   Sex     
men 104 5.3 3.5, 7.2 0.244
women 107 7.7 5.9, 9.5 0.412
   Age (years)     
17-44 120 7.0 5.2, 8.8 0.329
45-64 79 5.8 3.9, 7.8 0.329
≥ 65 12 6.1 -0.2, 12.5 0.316
   Educational level     
less than primary and primary 68 5.4 2.9, 7.8 0.226
secondary 74 6.5 4.6, 8.4 0.392
university 68 7.5 5.4, 9.6 0.435
   Body mass index (kg/m 2)     
underweight 4 --§ --§ --§
normal 116 8.2 6.5, 9.9 0.439
overweight 66 6.5 4.3, 8.7 0.350
obese 21 1.9 -0.8, 4.8 0.102
Type of tobacco     
   Type of cigarettes     
regular 148 5.8 4.4, 7.2 0.321
non-regular (light, ultralight, etc.) 63 8.4 5.7, 11.1 0.395
   Type of tobacco     
blond 171 6.9 5.5, 8.3 0.356
black 40 5.1 2.1, 8.0 0.244
   Use of filter tip     
with filter 209 6.3 5.1, 7.6 0.333
without filter 2 --§ --§ --§
Smoking characteristics     
   Frequency of inhalation     
all the time 21 5.9 2.3, 9.5 0.384
half the time 150 8.4 6.8, 9.9 0.439
seldom 39 3.3 0.6, 6.0 0.147
   Depth of inhalation     
light 22 7.9 2.8, 13.0 0.348
moderate 78 4.9 2.7, 7.0 0.217
deep 108 6.8 5.2, 8.3 0.416
  1. Barcelona (Spain), 2004-2005.
  2. * estimates from simple linear regression
  3. † 95% confidence interval of _
  4. ‡ underweight: <18.50 kg/m2; normal: 18.50-24.99 kg/m2; overweight: 25.00-29.99
  5. kg/m2; obese: _30.00 kg/m2
  6. §not computed for insufficient observations