Odds ratios (OR) of all tumours of the endocrine glands in workers exposed to high levels of ELF magnetic fields from welding, Sweden 1985–94
| All types of welding | Resistance welding | Arc welding | ||||
|---|---|---|---|---|---|---|
| Controls/cases | OR (95% CI)* | Controls/cases | OR (95% CI)* | Controls/cases | OR (95% CI)* | |
| *Odds ratios (with 95% confidence intervals), adjusted for sex, year of birth, solvent exposure, and year of inclusion. | ||||||
| †p for trend is based on average hours of welding per week, used as a continuous variable in the logistic regression model. | ||||||
| Never welding | 1030/115 | 1.0 | 1069/133 | 1.0 | 1075/120 | 1.0 |
| Ever welding | 92/25 | 2.1 (1.3 to 3.5) | 53/7 | 1.1 (0.5 to 2.4) | 47/20 | 2.9 (1.6 to 5.3) |
| Welding hours per week | ||||||
| 0 | 1030/115 | 1.0 | 1069/133 | 1.0 | 1075/120 | 1.0 |
| >0–10 | 32/8 | 1.9 (0.8 to 4.4) | 19/3 | 1.2 (0.3 to 4.3) | 18/6 | 2.2 (0.8 to 6.0) |
| >10–30 | 29/7 | 1.9 (0.8 to 4.6) | 24/4 | 1.4 (0.5 to 4.1) | 10/5 | 2.8 (0.9 to 9.1) |
| >30–40 | 31/10 | 2.5 (1.2 to 5.5) | 10/0 | – | 19/9 | 3.8 (1.6 to 9.3) |
| p for trend† | 0.01 | 0.63 | 0.00 | |||