Table 5.
Coefficients and confidence intervals for all covariates shown by year using simple regression.
| 2006 | 2007 | 2008 | 2009 | |||||
|---|---|---|---|---|---|---|---|---|
| β | CI | β | CI | β | CI | β | CI | |
| Age | 0.703 | 0.514-0.865 | 0.782 | 0.616-0.947 | 0.777 | 0.609-0.945 | 0.863 | 0.688-1.038 |
| Work duration | 0.055 | 0.043-0.066 | 0.059 | 0.047-0.071 | 0.058 | 0.046-0.070 | 0.065 | 0.053-0.077 |
| Smoking status(no/yes)* | 2.694 | -0.293-5.68 | 1.493 | -1.603-4.589 | 2.053 | -1.071-5.178 | 1.445 | -1.843-4.733 |
| Group (Firefighter/Factory worker)** |
15.887 | 13.028-18.747 | 15.012 | 11.992-18.032 | 13.528 | 10.407-16.649 | 15.858 | 12.644-19.073 |
Age, duration and group (firefighter or farm machinery factory worker) were all statistically significant
* Reference group is "No."
** Reference group is firefighters