Respiratory symptoms | ||||||
---|---|---|---|---|---|---|
Chronic cough+phlegm | Chronic wheeze | Breathlessness | ||||
Prev | OR (95% CI)† | Prev | OR (95% CI)† | Prev | OR (95% CI)† | |
*Production: toner production; development: machine development; maintenance: machine maintenance. | ||||||
†Prev: crude prevalence; OR: odds ratio; CI: confidence interval. | ||||||
Values shown are the crude prevalence and odds ratio, estimated by logistic regression analysis, for each exposure category relative to those for the control group, after adjustment for age and smoking status. The effects of age and smoking as confounding factors in these regression models are also shown. | ||||||
Control | 4.7 | 1.00 | 3.8 | 1.00 | 3.1 | 1.00 |
Exposed | ||||||
Total | 2.5 | 0.61 (0.26–1.43) | 6.5 | 1.81 (0.82–4.00) | 1.9 | 0.64 (0.22–1.81) |
Current status* | ||||||
Production | 3.6 | 0.74 (0.25–2.22) | 7.8 | 2.14 (0.84–5.45) | 0.8 | 0.24 (0.03–2.03) |
Development | 1.8 | 0.48 (0.10–2.27) | 7.0 | 1.91 (0.69–5.28) | 3.7 | 1.40 (0.37–5.30) |
Maintenance | 2.4 | 0.57 (0.21–1.60) | 5.8 | 1.60 (0.66–3.84) | 1.8 | 0.67 (0.26–1.77) |
Cumulative status | ||||||
1–10 | 3.0 | 0.78 (0.29–2.09) | 8.5 | 2.49 (1.07–5.81) | 1.6 | 0.54 (0.15–2.02) |
11–20 | 1.7 | 0.38 (0.12–1.15) | 5.1 | 1.43 (0.59–3.48) | 2.3 | 0.72 (0.23–2.23) |
21+ | 7.4 | 1.57 (0.31–7.82) | 3.8 | 0.92 (0.19–4.54) | 0 | – |
Confounders | ||||||
Age (/10 years) | – | 1.38 (0.88–2.16) | – | 1.05 (0.73–1.52) | – | 1.09 (0.61–1.95) |
Smoking (/pack) | – | 2.28 (1.21–4.33) | – | 0.96 (0.74–1.23) | – | 1.26 (0.85–1.89) |