Larynx | Hypopharynx | ||||||
---|---|---|---|---|---|---|---|
Cases/ controls | Adjusted OR | 95% CI | Cases/ controls | Adjusted OR | 95% CI | ||
Formaldehyde: | |||||||
Never exposed | 194/211 | 1.00 | — | 118/211 | 1.00 | — | |
Ever exposed | 44/35 | 1.17 | 0.63–2.17 | 41/35 | 1.74 | 0.91–3.34 | |
Duration of exposure (y): | |||||||
⩽7 | 15/7 | 1.68 | 0.60–4.72 | 6/7 | 0.74 | 0.20–2.68 | |
7–20 | 14/12 | 0.86 | 0.33–2.24 | 19/12 | 1.65 | 0.67–4.08 | |
>20 | 15/16 | 1.14 | 0.47–2.74 | 16/16 | 2.70 | 1.08–6.73 | |
Cumulative level: | |||||||
Low | 4/2 | 0.68 | 0.12–3.90 | 3/2 | 0.78 | 0.11–5.45 | |
Medium | 17/11 | 1.86 | 0.76–4.55 | 13/11 | 1.77 | 0.65–4.78 | |
High | 23/22 | 0.91 | 0.42–1.99 | 25/22 | 1.92 | 0.86–4.32 | |
Coal dust: | |||||||
Never exposed | 254/270 | 1.00 | — | 163/270 | 1.00 | — | |
Ever exposed | 27/16 | 1.70 | 0.80–3.59 | 23/16 | 2.71 | 1.18–6.23 | |
Duration of exposure (y): | |||||||
<6 | 8/3 | 2.25 | 0.53–9.51 | 6/3 | 3.45 | 0.77–15.5 | |
6–20 | 6/4 | 1.28 | 0.28–5.38 | 7/4 | 1.34 | 0.29–6.06 | |
>20 | 13/9 | 1.65 | 0.61–4.48 | 10/9 | 3.31 | 1.05–10.3 | |
Cumulative level: | |||||||
Low | 1/0 | — | — | 0/0 | — | — | |
Medium | 11/7 | 1.51 | 0.52–4.44 | 9/7 | 2.07 | 0.66–6.55 | |
High | 15/9 | 1.78 | 0.66–4.82 | 14/9 | 3.44 | 1.13–10.4 |
4-150 For each substance, adjustments used in table 3 were kept in the present analysis.