Table 4

Smoking behaviour, mental health, harmful alcohol use, and occupation categories in univariated and multivariated conditional regression models

 UnivariatedMultivariated
CasesControlsOR (CI 95%)p ValueaOR (CI 95%)p value
Smoking habits
 Median (IQR) age at beginning (years)17 (15–20)18 (15–20)1.5 (1.0 to 2.4)*0.062.1 (1.1 to 4.0)*0.02
 Median (IQR) number of packs per day1 (1–1.8)1 (1–1.5)3.9 (1.2 to 12.7)†0.028.5 (1.9 to 38.4)†0.006
 Nb of brand median (IQR)2 (1–3)2 (2–3)0.9 (0.7 to 1.2)0.39
 Breaks median (IQR)1 (0–2)2 (1–3)0.7 (0.5 to 1)0.03
 Nb patients smoking unfiltered cigarettes20 (41)9 (18)3.2 (1.2 to 8.7)0.024.2 (1.1 to 16.0)0.04
 Nb patients smoking low tar cigarettes7 (14)17 (35)0.3 (0.1 to 0.9)0.03
Mental health and harmful alcohol use
 Harmful alcohol use‡25 (51)10 (20)3.5 (1.4 to 8.7)0.0074.6 (1.2 to 17.2)0.02
 Other psychiatric condition§22 (45)14 (29)1.7 (0.8 to 3.7)0.18
 On psychotropic medication¶33 (67)20 (41)2.4 (1.1 to 5.3)0.02
Occupation
 Unemployment17 (35)12 (24)1.7 (0.7 to 4.3)0.26
  • Values are numbers (percentage) unless stated otherwise.

  • *For every 2 years younger than 22 years.

  • †For every 10 cigarettes more than 20.

  • ‡More than 14 drinks/week for women, more than 21 drinks/week for men associated with alcohol withdrawal or documented complications.

  • §According to the medical chart and DSM-IV criteria.

  • ¶Antidepressant, anxiolytic, neuroleptic and antiepileptic (used as mood stabiliser) drug.

  • aOR, adjusted OR; DSM-IV, Diagnostic and Statistical Manual of Mental Disorders.