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Table 3 Factors related to commencing smoking in 12-year-old students in Catalonia (Spain)

From: Factors associated with commencing smoking in 12-year-old students in Catalonia (Spain): a cross-sectional population-based study

  Logistic model Multilevel logistic model
  OR [95%CI] OR [95%CI]
Age 2.33[ 1.74- 3.11 ] 2.27[1.85-2.79]
Perception of tobacco as detrimental to health
Agree 1 1
Disagree 2.76 [1.69 - 4.52] 2.86 [1.74 - 4.63]
Completely disagree 10.74 [0.68 - 4.45] 1.77 [0.67 - 4.58]
Perception of tobacco as an addictive substance
Agree 1 1
Disagree 3.50[1.82-6.76] 3.46[1.79-6.67]
Completely disagree 3.50[1.82-6.76] 3.46[1.79-6.67]
Consumption in family and social setting
Non-smoker mother 1 1
Smoker or former smoker mother 1.75[1.10-2.78] 1.76 [1.10-2.84]
Non-smoker siblings 1 1
Smoker siblings 1.99[1.29-3.05] 2.02[1.31-3.11]
Non-smoker friends 1 1
Some smoker friends 9.55[4.49-20.32] 9.86[4.27-22.76]
Almost all smoker friends 32.75[14.03-76.43] 36.31[14.25-92.47]
All smoker friends 66.40[18.40-239.61] 75.64[18.37-311.41]
Girl with smoker mother 0.50[0.30-0.85] 0.48[0.28-0.82]
Carbon monoxide measurement in inspired air
Co-oximetry < 6 p.p.m. 1 1
Co-oximetry 6 to 10 p.p.m. 2.29[1.08-4.84] 2.29[1.07-4.91]
Co-oximetry > 10 p.p.m. 3.58 [1.32-9.72] 3.94[1.38-11.30]
Intercenter variation
Intercenter variation   0.045 (n.s)
Intercenter variation
Mean number of students registered   1.007[1.001-1.013]
Contrast adjustment
Hosmer & Lemeshow 7.32 P = 0.5022 9.27 p = 0.3201
ROC 0.868[0.836-0.899] 0.871[0.840-0.902]
  1. Abbreviations: n.s. (non-significant)