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Table 1 Main characteristics of cases and controls

From: Occupational exposure to petroleum-based and oxygenated solvents and hypopharyngeal and laryngeal cancer in France: the ICARE study

  Hypopharyngeal cancer n = 383 Laryngeal cancer n = 454 Controls n = 2780
  n % n % n %
Age
 < 40 0 0.0 5 1.10 76 2.7
 40–49 51 13.3 56 12.3 555 20.0
 50–59 164 42.8 175 38.6 825 29.7
 60–69 118 30.8 147 32.4 939 33.8
 ≥ 70 50 13.1 71 15.6 385 13.9
Socioeconomic status
 Farmers 8 2.1 18 4.0 168 6.0
 Self-employed workers 25 6.6 34 7.5 152 5.5
 Managers 21 5.5 34 7.5 544 19.6
 Intermediate occupations 32 8.4 55 12.2 564 20.3
 Employees 40 10.4 45 10.0 297 10.7
 Blue collar workers 252 65.8 265 58.8 1053 37.9
Alcohol consumption, glasses/day
 ≤ 0.03 11 2.9 19 4.2 206 7.5
 0.04–2.00 34 8.9 70 15.4 1190 42.8
 2.01–4.99 89 23.2 110 24.2 849 30.5
 5.00–7.99 78 20.4 108 23.8 305 10.9
 8.00–11.99 82 21.4 74 16.3 134 4.8
 ≥ 12 70 18.3 54 11.9 73 2.6
Smoking status
 Never 3 0.8 13 2.9 753 27.1
 Former 121 31.6 122 26.9 1271 45.7
 Current 256 66.9 317 69.8 751 27.0
Lifetime exposure prevalence
Petroleum-based solvents
  Benzene   16.9   15.6   11.7
  Gasoline   11.6   11.1   8.7
  Special petroleum-based products   3.6   2.6   2.5
  Diesel, fuels and kerosene   20.0   18.4   14.4
  White spirits   21.3   18.7   14.4
Oxygenated solvents
  Ketones and esters   13.5   11.8   9.5
  Alcohols   12.2   11.5   12.9
  Diethyl ether   0.4   0.6   1.4
  Ethylene glycol   6.5   7.0   6.1
  Tetrahydrofuran   1.6   1.0   0.7