Poisson regression model of eye injury rates (adjusted for non-eye injury rates) for each sector, period, and interaction
| IRR | 95% CI | p value | % decline* | |
|---|---|---|---|---|
| *% decline = 100 (1−exp(b1)), where b1 is the estimate of the (trend) parameter. | ||||
| †Referent levels for the categorical variables. | ||||
| ‡Referent level for interactions is “wood/ceramics–pre-intervention (1988–90)”. | ||||
| Sectors | ||||
| Wood/ceramics† | 1.00 | – | – | |
| Metal | 4.93 | 4.25 to 5.73 | <0.001 | |
| Construction | 2.24 | 1.46 to 3.43 | <0.001 | |
| Periods | ||||
| Pre-intervention (1988–90)† | 1.00 | – | – | – |
| Peri-intervention (1991–92) | 0.95 | 0.74 to 1.23 | 0.717 | 4.6 |
| Post-intervention reinforcement (1993–96) | 0.94 | 0.72 to 1.23 | 0.650 | 6.1 |
| Late post-intervention (1997–2000) | 1.06 | 0.78 to 1.45 | 0.704 | −6.2 |
| Very late post-intervention (2001–03) | 0.79 | 0.59 to 1.05 | 0.107 | 21.4 |
| Interactions‡ | ||||
| Metal–Peri-intervention (1991–92) | 0.90 | 0.70 to 1.16 | 0.423 | 9.9 |
| Metal–Post-intervention reinforcement (1993–96) | 0.77 | 0.61 to 0.97 | 0.024 | 23.4 |
| Metal–Late post-intervention (1997–2000) | 0.63 | 0.50 to 0.79 | <0.001 | 37.4 |
| Metal–Very late post-intervention (2001–03) | 0.58 | 0.43 to 0.77 | <0.001 | 42.4 |
| Construction–Peri-intervention (1991–92) | 1.01 | 0.74 to 1.37 | 0.960 | −0.8 |
| Construction–Post-intervention reinforcement (1993–96) | 0.81 | 0.61 to 1.08 | 0.144 | 19.1 |
| Construction–Late post-intervention (1997–2000) | 0.67 | 0.50 to 0.90 | 0.009 | 32.8 |
| Construction–Very late post-intervention (2001–03) | 0.93 | 0.69 to 1.26 | 0.645 | 6.8 |