| Wood dust exposure | Cases,n (%) | Controls,n (%) | Adjusted OR,OR (95% CI) | p Trend |
| All squamous upper aero-digestive cancers* (cases = 725 and controls = 1522) | ||||
| Never exposed | 519 (71.6) | 1153 (75.8) | Ref | |
| Occasionally exposed | 129 (17.8) | 262 (17.2) | 1.01 (0.77 to 1.31) | 0.20 |
| Regularly exposed | 77 (10.6) | 107 (7.0) | 1.33 (0.93 to 1.90) | |
| Squamous cell carcinoma of the oral cavity and oropharynx† (cases = 218 and controls = 1522) | ||||
| Never exposed | 169 (77.5) | 1153 (75.8) | Ref | |
| Occasionally exposed | 28 (12.8) | 262 (17.2) | 0.68 (0.44 to 1.06) | 0.89 |
| Regularly exposed | 21 (9.6) | 107 (7.0) | 1.27 (0.76 to 2.14) | |
| Squamous cell carcinoma of the nasal cavity and naso- pharynx and hypopharynx‡ (cases = 67 and controls = 1522) | ||||
| Never exposed | 42 (62.7) | 1153 (75.8) | Ref | |
| Occasionally exposed | 17 (25.4) | 262 (17.2) | 1.83 (1.01 to 3.33) | 0.02 |
| Regularly exposed | 8 (11.9) | 107 (7.0) | 2.15 (0.98 to 4.72) | |
| Squamous cell carcinoma of the larynx§ (cases = 121 and controls = 1522) | ||||
| Never exposed | 85 (70.2) | 1153 (75.8) | Ref | |
| Occasionally exposed | 21 (17.4) | 262 (17.2) | 0.75 (0.42 to 1.35) | 0.54 |
| Regularly exposed | 15 (12.4) | 107 (7.0) | 1.50 (0.79 to 2.83) | |
| Squamous cell carcinoma of the lung and trachea¶ (cases = 266 and controls = 1522) | ||||
| Never exposed | 177 (66.5) | 1153 (75.8) | Ref | |
| Occasionally exposed | 57 (21.4) | 262 (17.2) | 1.43 (0.97 to 2.10) | 0.003 |
| Regularly exposed | 32 (12.0) | 107 (7.0) | 1.93 (1.18 to 3.17) | |
| Squamous cell carcinoma of the oesophagus** (cases = 53 and controls = 1522) | ||||
| Never exposed | 46 (86.8) | 1153 (75.8) | Ref | |
| Occasionally exposed | 6 (11.3) | 262 (17.2) | 0.61 (0.25 to 1.49) | 0.09 |
| Regularly exposed | 1 (1.9) | 107 (7.0) | 0.25 (0.03 to 1.81) | |
OR, odds ratio.
*Adjusted for age, education, pack years of smoking, body mass index, family income, smoking status and year of enrolment.
†Adjusted for age, pack years of smoking, body mass index, smoking status, alcoholic drinks per week, education and year of enrolment.
‡Adjusted for age, education, pack years of smoking and year of enrolment.
§Adjusted for age, education, pack years of smoking, smoking status and year of enrolment.
¶Adjusted for age, education, pack years of smoking, body mass index, smoking status, family income and year of enrolment.
**Adjusted for age, pack years of smoking, and year of enrolment.