Table 4
Wood dust exposure concentration, duration and cumulative exposure relative to risk of nasopharyngeal cancer 4-150
| Exposure to wood dust | Controls (n=244) n |
Cases (n=142) n |
Adjusted for formaldehyde | ||||
|---|---|---|---|---|---|---|---|
| No OR4-151 (95% CI) |
Yes OR4-152 (95% CI) |
||||||
| Unexposed | 220 | 125 | 1.0 (reference) | 1.0 (reference) | |||
| Ever exposed | 24 | 17 | 1.5 (0.7 to 3.3) | 1.2 (0.5 to 2.7) | |||
| Maximum exposure (mg/m3): | |||||||
| >0.0–0.55 | 15 | 10 | 1.7 (0.7 to 4.4) | 1.3 (0.5 to 3.6) | |||
| >0.55–1.50 | 4 | 6 | 2.5 (0.6 to 10.2) | 2.0 (0.5 to 8.1) | |||
| >1.50 | 5 | 1 | 0.3 (0.0 to 3.2) | 0.2 (0.0 to 2.1) | |||
| Trend test | p=0.76 | p=0.68 | |||||
| Duration (y): | |||||||
| 1–4 | 12 | 8 | 1.5 (0.5 to 4.2) | 1.4 (0.5 to 4.4) | |||
| 5–13 | 6 | 4 | 1.4 (0.3 to 5.6) | 1.3 (0.3 to 5.4) | |||
| ⩾14 | 6 | 5 | 1.8 (0.5 to 7.3) | 0.8 (0.2 to 3.7) | |||
| Trend test | p=0.27 | p=0.74 | |||||
| Cumulative exposure (mg/m3-years): | |||||||
| >0.0–2.75 | 13 | 5 | 0.9 (0.3 to 3.0) | 0.7 (0.2 to 2.5) | |||
| >2.75–15.70 | 5 | 10 | 3.9 (1.2 to 12.5) | 3.0 (0.9 to 9.8) | |||
| >15.70 | 6 | 2 | 0.6 (0.1 to 3.7) | 0.4 (0.1 to 2.3) | |||
| Trend test | p=0.42 | p=0.99 | |||||
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↵4-150 Excluding undifferentiated and non-keratinising histologies.
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↵4-151 OR adjusted for age, sex, race, SEER site, cigarette use, proxy status, and education.
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↵4-152 OR also adjusted for cumulative exposure to formaldehyde with the log transformed continuous measure and including jobs with possible or higher probabilities of exposure.
