Age-adjusted annual percentage change (APC) and estimated changes in slopes in yearly incidence rates of workplace injury deaths in New Zealand workers during three time periods with different legislation, 1985–2014
| Pre 1985–1992 | Post 1 1993–2002 | Post 2 2003–2014 | Change in slope | ||||||
| Post-1:Pre | Post-2:Post-1 | ||||||||
| Adj APC§ (95% CI) | Adj APC§ (95% CI) | Adj APC§ (95% CI) | Coef. | 95% CI | P value | Coef. | 95% CI | P value | |
| Overall: age adjusted | −2.76 (−5.47 to −0.04) | −2.90 (−4.50 to −1.29) | −2.87 (−4.39 to −1.34) | −0.001 | −0.042 to 0.039 | 0.9 | 0.000 | −0.029 to 0.029 | 1.0 |
| Industry | |||||||||
| Historical high risk* | −0.23 (−3.45 to 3.00) | −1.47 (−3.36 to 0.41) | −2.74 (−4.51 to −0.98) | −0.013 | −0.059 to 0.340 | 0.6 | −0.013 | −0.046 to 0.020 | 0.4 |
| Specific high risk† | |||||||||
| Agriculture | −0.51 (−4.68 to 3.66) | −2.00 (−4.46 to 0.46) | 0.86 (−1.15 to 3.22) | −0.015 | −0.076 to 0.045 | 0.6 | 0.029 | −0.015 to 0.072 | 0.2 |
| Construction | −4.81 (−11.94 to 2.32) | −4.41 (−8.93 to 0.10) | −1.22 (−5.47 to 3.03) | 0.004 | −0.107 to 0.115 | 0.9 | 0.033 | −0.048 to 0.114 | 0.4 |
| Transport | 2.44 (−6.36 to 11.24) | 4.82 (0.08 to 9.56) | −8.07 (−12.05 to −4.09) | 0.023 | −0.096 to 0.142 | 0.7 | −0.131 | −0.209 to −0.054 | 0.001 |
| Occupation | |||||||||
| Historical high risk‡ | −3.13 (−6.91 to 0.64) | 1.37 (−0.92 to 3.67) | −1.56 (−3.56 to 0.44) | 0.045 | −0.106 to 0.102 | 0.1 | −0.029 | −0.068 to 0.009 | 0.1 |
| Specific high risk† | |||||||||
| Fishery workers | −6.66 (−16.01 to 2.68) | 1.30 (−5.68 to 8.27) | −2.95 (−10.17 to 4.27) | 0.082 | −0.072 to 0.235 | 0.3 | −0.043 | −0.170 to 0.085 | 0.5 |
| Forestry workers | 6.96 (−3.18 to 17.11) | −8.52 (−14.21 to −2.84) | 8.70 (2.46 to 14.93) | −0.156 | −0.297 to −0.016 | 0.03 | 0.172 | 0.064 to 0.281 | 0.002 |
| Farmers and workers | −1.55 (−8.60 to 5.49) | 5.88 (1.94 to 9.81) | −1.06 (−4.01 to 1.89) | 0.073 | −0.026 to 0.172 | 0.2 | −0.068 | −0.127 to −0.008 | 0.03 |
*In addition to the three specific industry groups listed, this estimate includes: mining, electricity/gas/water.
†Restricted to groups with >120 deaths over 30 years.
‡In addition to the three specific occupational groups listed, this estimate includes: pilots/flight crew, Builder’s labourers, hunters/trappers, tour/outdoor guides, professional sportspeople, earthmoving plant operators, mining plant operators, railway workers, electrical lines workers/cable jointers, heavy truck/tanker drivers.
§Age-adjusted APC that is averaged % of previous year’s rate. Those for whom age was not available (n=17) were excluded.